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126 lines
70 KiB
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126 lines
70 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
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<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="D21C" definition-exists="true" date-revised="2018-08-01" status="published"><classification-symbol>D21C</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS</text></title-part><title-part><text>REGENERATION OF PULPING LIQUORS</text></title-part><title-part><text>APPARATUS THEREFOR</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="D21C1/00" date-revised="2013-01-01" status="published"><classification-symbol>D21C1/00</classification-symbol>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="D21C1/00" definition-exists="true" ipc-concordant="D21C1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pretreatment of the finely-divided materials before digesting </text><reference><text>of waste paper <class-ref scheme="cpc">D21C5/02</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C1/02" definition-exists="false" ipc-concordant="D21C1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with water or steam</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C1/04" definition-exists="false" ipc-concordant="D21C1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with acid reacting compounds</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C1/06" definition-exists="false" ipc-concordant="D21C1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C1/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with alkaline reacting compounds</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C1/08" definition-exists="false" ipc-concordant="D21C1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C1/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with oxygen-generating compounds</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C1/10" definition-exists="false" ipc-concordant="D21C1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C1/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Physical methods for facilitating impregnation</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="D21C3/00" definition-exists="true" ipc-concordant="D21C3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pulping cellulose-containing materials </text><reference><text>digesters <class-ref scheme="cpc">D21C7/00</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C3/003" definition-exists="false" ipc-concordant="D21C3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with organic compounds </text><reference><text><class-ref scheme="cpc">D21C3/20</class-ref> and <class-ref scheme="cpc">D21C3/222</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C3/006" definition-exists="false" ipc-concordant="D21C3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with compounds not otherwise provided for</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C3/02" definition-exists="false" ipc-concordant="D21C3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with inorganic bases or alkaline reacting compounds, e.g. sulfate processes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/022" definition-exists="false" ipc-concordant="D21C3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/022</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in presence of S-containing compounds</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/024" definition-exists="false" ipc-concordant="D21C3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/024</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with NH<sub>3</sub> or H<sub>2</sub>O</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/026" definition-exists="false" ipc-concordant="D21C3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in presence of O<sub>2</sub>, e.g. air</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/028" definition-exists="false" ipc-concordant="D21C3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in presence of O<sub>3</sub></text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C3/04" definition-exists="false" ipc-concordant="D21C3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with acids, acid salts or acid anhydrides </text><CPC-specific-text><reference><text><class-ref scheme="cpc">D21C3/003</class-ref> and <class-ref scheme="cpc">D21C3/222</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/045" definition-exists="false" ipc-concordant="D21C3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in presence of O<sub>2</sub> or O<sub>3</sub></text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/06" definition-exists="false" ipc-concordant="D21C3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>sulfur dioxide</text></title-part><title-part><text>sulfurous acid</text></title-part><title-part><text>bisulfites </text><CPC-specific-text><text>sulfites</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C3/08" definition-exists="false" ipc-concordant="D21C3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>calcium bisulfite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C3/10" definition-exists="false" ipc-concordant="D21C3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>magnesium bisulfite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C3/12" definition-exists="false" ipc-concordant="D21C3/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>sodium bisulfite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C3/14" definition-exists="false" ipc-concordant="D21C3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>ammonium bisulfite</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/16" definition-exists="false" ipc-concordant="D21C3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>nitrogen oxides</text></title-part><title-part><text>nitric acid </text><CPC-specific-text><text>nitrates, nitrites</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C3/18" definition-exists="false" ipc-concordant="D21C3/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with halogens or halogen-generating compounds </text><reference><text>bleaching cellulose pulp <class-ref scheme="cpc">D21C9/12</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C3/20" definition-exists="false" ipc-concordant="D21C3/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with organic solvents </text><CPC-specific-text><text>or in solvent environment</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C3/22" definition-exists="false" ipc-concordant="D21C3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Other features of pulping processes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/222" definition-exists="false" ipc-concordant="D21C3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/222</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Use of compounds accelerating the pulping processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/224" definition-exists="false" ipc-concordant="D21C3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/224</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Use of means other than pressure and temperature</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/226" definition-exists="false" ipc-concordant="D21C3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Use of compounds avoiding scale formation</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/228" definition-exists="false" ipc-concordant="D21C3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/228</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Automation of the pulping processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/24" definition-exists="false" ipc-concordant="D21C3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Continuous processes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/26" definition-exists="false" ipc-concordant="D21C3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multistage processes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C3/263" definition-exists="false" ipc-concordant="D21C3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/263</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>at least one stage being in presence of oxygen</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C3/266" definition-exists="false" ipc-concordant="D21C3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/266</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the same pulping agent being used in all stages </text><reference><text><class-ref scheme="cpc">D21C3/263</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C3/28" definition-exists="false" ipc-concordant="D21C3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C3/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Prevention of foam</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="D21C5/00" definition-exists="true" ipc-concordant="D21C5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Other processes for obtaining cellulose, e.g. cooking cotton linters </text><reference><text>obtaining fibres for spinning <class-ref scheme="cpc">D01C</class-ref></text></reference><text>; </text><CPC-specific-text><text>Processes characterised by the choice of cellulose-containing starting materials</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C5/005" definition-exists="false" ipc-concordant="D21C5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>D21C5/005</classification-symbol><class-title date-revised="2017-08-01"><title-part><CPC-specific-text><text>Treatment of cellulose-containing material with microorganisms or enzymes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C5/02" definition-exists="false" ipc-concordant="D21C5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Working-up waste paper </text><reference><text>mechanical part <class-ref scheme="cpc">D21B1/08</class-ref>, <class-ref scheme="cpc">D21B1/32</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C5/022" definition-exists="false" ipc-concordant="D21C5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C5/022</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Chemicals therefor</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C5/025" definition-exists="false" ipc-concordant="D21C5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C5/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>De-inking</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C5/027" definition-exists="false" ipc-concordant="D21C5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C5/027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Chemicals therefor</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="D21C7/00" definition-exists="true" ipc-concordant="D21C7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Digesters</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C7/02" definition-exists="false" ipc-concordant="D21C7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Rotary digesters</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C7/04" definition-exists="false" ipc-concordant="D21C7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Linings</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C7/06" definition-exists="false" ipc-concordant="D21C7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Feeding devices</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C7/08" definition-exists="false" ipc-concordant="D21C7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Discharge devices</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C7/10" definition-exists="false" ipc-concordant="D21C7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Heating devices</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C7/12" definition-exists="false" ipc-concordant="D21C7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices for regulating or controlling</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C7/14" definition-exists="false" ipc-concordant="D21C7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Means for circulating the lye</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C7/16" definition-exists="false" ipc-concordant="D21C7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C7/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Safety devices</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="D21C9/00" definition-exists="true" ipc-concordant="D21C9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>D21C9/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters </text><CPC-specific-text><text>; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere </text><reference><text>polysaccharides, derivatives thereof <class-ref scheme="cpc">C08B</class-ref>; paper-making <class-ref scheme="cpc">D21B</class-ref> - <class-ref scheme="cpc">D21H</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C9/001" definition-exists="false" ipc-concordant="D21C9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Modification of pulp properties </text><reference><text>purification <class-ref scheme="cpc">D21C9/08</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/002" definition-exists="false" ipc-concordant="D21C9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/004" definition-exists="false" ipc-concordant="D21C9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>inorganic compounds</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/005" definition-exists="false" ipc-concordant="D21C9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>organic compounds</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/007" definition-exists="false" ipc-concordant="D21C9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by mechanical or physical means</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C9/008" definition-exists="false" ipc-concordant="D21C9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Prevention of corrosion or formation of deposits on pulp-treating equipment </text><reference><text><class-ref scheme="cpc">D21C9/08</class-ref>, <class-ref scheme="cpc">D21H21/02</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C9/02" definition-exists="false" ipc-concordant="D21C9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>D21C9/02</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Washing </text><CPC-specific-text><text>; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/04" definition-exists="false" ipc-concordant="D21C9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>D21C9/04</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>in diffusers </text><CPC-specific-text><text>; Washing of pulp of fluid consistency without substantially thickening</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/06" definition-exists="false" ipc-concordant="D21C9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>D21C9/06</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>in filters </text><CPC-specific-text><text>; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C9/08" definition-exists="false" ipc-concordant="D21C9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Removal of fats, resins, pitch or waxes; </text><CPC-specific-text><text>Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching </text><reference><text>fats, waxes <class-ref scheme="cpc">C11B</class-ref>; natural resins <class-ref scheme="cpc">C09F1/00</class-ref>; hemicellulose <class-ref scheme="cpc">C08B37/14</class-ref>; purification by mechanical means <class-ref scheme="cpc">D21D5/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/083" definition-exists="false" ipc-concordant="D21C9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/083</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with inorganic compounds </text><reference><text><class-ref scheme="cpc">D21C9/086</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/086" definition-exists="false" ipc-concordant="D21C9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with organic compounds or compositions comprising organic compounds</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C9/10" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>D21C9/10</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Bleaching </text><CPC-specific-text><text>; Apparatus therefor</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1005" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pretreatment of the pulp, e.g. degassing the pulp</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/101" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/101</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in solvent medium</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1015" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1015</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with use of means other than pressure, temperature</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1021" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Electrochemical processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1026" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Other features in bleaching processes</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/1031" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1031</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pulse, dynamic, displacement processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/1036" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1036</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Use of compounds accelerating or improving the efficiency of the processes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/1042" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Use of chelating agents</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/1047" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1047</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Conserving the bleached pulp</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/1052" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1052</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the process</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1057" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multistage, with compounds cited in more than one sub-group <class-ref scheme="cpc">D21C9/10</class-ref>, <class-ref scheme="cpc">D21C9/12</class-ref>, <class-ref scheme="cpc">D21C9/16</class-ref></text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1063" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with compounds not otherwise provided for, e.g. activated gases</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1068" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with O<sub>2</sub> </text><reference><text>closed, <u>see</u> <class-ref scheme="cpc">D21C9/147</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1073" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with O<sub>3</sub> </text><reference><text>closed, <u>see</u> <class-ref scheme="cpc">D21C9/153</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1078" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1078</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with Mn-containing compounds</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/1084" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with reducing compounds</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/1089" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1089</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with dithionites</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/1094" definition-exists="false" ipc-concordant="D21C9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/1094</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with H<sub>2</sub></text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/12" definition-exists="false" ipc-concordant="D21C9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with halogens or halogen-containing compounds </text><reference><text><class-ref scheme="cpc">D21C9/16</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/123" definition-exists="false" ipc-concordant="D21C9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/123</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with Cl<sub>2</sub>O</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/126" definition-exists="false" ipc-concordant="D21C9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/126</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with perhalogeno compounds</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/14" definition-exists="false" ipc-concordant="D21C9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with ClO<sub>2</sub> or chlorites</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="D21C9/142" definition-exists="false" ipc-concordant="D21C9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/142</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with ClO<sub>2</sub>/Cl<sub>2</sub> in a multistage process involving ClO<sub>2</sub>/Cl<sub>2</sub> exclusively</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="D21C9/144" definition-exists="false" ipc-concordant="D21C9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/144</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with ClO<sub>2</sub>/Cl<sub>2</sub> and other bleaching agents in a multistage process</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/147" definition-exists="false" ipc-concordant="D21C9/147" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/147</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with oxygen or its allotropic modifications </text><reference><text><class-ref scheme="cpc">D21C9/16</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/153" definition-exists="false" ipc-concordant="D21C9/153" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/153</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with ozone</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/16" definition-exists="false" ipc-concordant="D21C9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with per compounds</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/163" definition-exists="false" ipc-concordant="D21C9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/163</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with peroxides</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C9/166" definition-exists="false" ipc-concordant="D21C9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/166</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with peracids</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C9/18" definition-exists="false" ipc-concordant="D21C9/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>De-watering </text><reference><text>de-watering in general <class-ref scheme="cpc">F26B</class-ref></text></reference></title-part><title-part><CPC-specific-text><text>Elimination of cooking or pulp-treating liquors from the pulp</text></CPC-specific-text><reference><text><class-ref scheme="cpc">D21C9/002</class-ref>, <class-ref scheme="cpc">D21C9/02</class-ref> take precedence; paper-making machines <class-ref scheme="cpc">D21F</class-ref>; strainers in digesters <class-ref scheme="cpc">D21C7/00</class-ref>; presses in general <class-ref scheme="cpc">B30B</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C9/185" definition-exists="false" ipc-concordant="D21C9/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C9/185</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising at least one step where the pulp is suspended in a gaseous medium, e.g. flash drying</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="D21C11/00" definition-exists="true" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Regeneration of pulp liquors </text><CPC-specific-text><text>or effluent waste waters</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/0007" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for </text><reference><text>volatile compounds obtained by decomposition of spent liquors in order to regenerate them <class-ref scheme="cpc">D21C11/125</class-ref>; compounds obtained by fractionating the liquors in order to regenerate them <class-ref scheme="cpc">D21C11/0042</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/0014" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0014</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Combination of various pulping processes with one or several recovery systems (cross-recovery)</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/0021" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/0028" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Effluents derived from the washing or bleaching plants</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/0035" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0035</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Introduction of compounds, e.g. sodium sulfate, into the cycle in order to compensate for the losses of pulping agents</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/0042" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fractionating or concentration of spent liquors by special methods </text><reference><text>concentration by evaporation <class-ref scheme="cpc">D21C11/10</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/005" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Treatment of liquors with ion-exchangers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/0057" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Oxidation of liquors, e.g. in order to reduce the losses of sulfur compounds, followed by evaporation or combustion if the liquor in question is a black liquor </text><reference><text>deodorisation of gases <class-ref scheme="cpc">D21C11/08</class-ref>; combustion <class-ref scheme="cpc">D21C11/12</class-ref>, <class-ref scheme="cpc">D21C11/14</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/0064" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0064</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/0071" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0071</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Treatment of green or white liquors with gases, e.g. with carbon dioxide for carbonation; Expulsion of gaseous compounds, e.g. hydrogen sulfide, from these liquors by this treatment (stripping); Optional separation of solid compounds formed in the liquors by this treatment </text><reference><text>oxidation of liquors (black, green or white) <class-ref scheme="cpc">D21C11/0057</class-ref>; treatment of pulp gases <class-ref scheme="cpc">D21C11/06</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/0078" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0078</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Treatment of green or white liquors with other means or other compounds than gases, e.g. in order to separate solid compounds such as sodium chloride and carbonate from these liquors; Further treatment of these compounds </text><reference><text>fractionating of spent liquors <class-ref scheme="cpc">D21C11/0042</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/0085" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Introduction of auxiliary substances into the regenerating system in order to improve the performance of certain steps of the latter, the presence of these substances being confined to the regeneration cycle </text><reference><text>introduction of compounds in order to make up for the losses of pulping agents <class-ref scheme="cpc">D21C11/0035</class-ref>; conventional causticizing of green liquors <class-ref scheme="cpc">D21C11/0064</class-ref>; fractionating of spent liquors <class-ref scheme="cpc">D21C11/0042</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/0092" definition-exists="false" ipc-concordant="D21C11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/0092</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Substances modifying the evaporation, combustion, or thermal decomposition processes of black liquor </text><reference><text>treatment of solid substances (ash) separated from combustion gases <class-ref scheme="cpc">D21C11/066</class-ref>; avoiding scale-forming during evaporation <class-ref scheme="cpc">D21C11/106</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/02" definition-exists="false" ipc-concordant="D21C11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of </text><CPC-specific-text><text>acid, neutral or alkaline</text></CPC-specific-text><text> sulfite lye</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/04" definition-exists="false" ipc-concordant="D21C11/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of alkali lye</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/06" definition-exists="false" ipc-concordant="D21C11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Treatment of pulp gases</text></title-part><title-part><text>Recovery of the heat content of the gases; </text><CPC-specific-text><text>Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO<sub>2</sub>, e.g. arising from liquors containing sulfur compounds</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/063" definition-exists="false" ipc-concordant="D21C11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>D21C11/063</classification-symbol><class-title date-revised="2017-05-01"><title-part><CPC-specific-text><text>Treatment of gas streams comprising solid matter, e.g. the ashes resulting from the combustion of black liquor </text><reference><text>evaporation of pulp liquors by direct contact with gases <class-ref scheme="cpc">D21C11/103</class-ref>; post-combustion of gases <class-ref scheme="cpc">D21C11/127</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C11/066" definition-exists="false" ipc-concordant="D21C11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Separation of solid compounds from these gases; further treatment of recovered products</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/08" definition-exists="false" ipc-concordant="D21C11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Deodorisation </text><CPC-specific-text><text>Elimination of malodorous compounds, e.g. sulfur compounds such as hydrogen sulfide and mercaptans, from gas streams </text><reference><text>oxidation of liquors <class-ref scheme="cpc">D21C11/0057</class-ref>; post-combustion of gases <class-ref scheme="cpc">D21C11/127</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/10" definition-exists="false" ipc-concordant="D21C11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Concentrating spent liquor by evaporation </text><reference><text>evaporators <class-ref scheme="cpc">B01D</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/103" definition-exists="false" ipc-concordant="D21C11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/103</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Evaporation by direct contact with gases, e.g. hot flue gases</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/106" definition-exists="false" ipc-concordant="D21C11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/106</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Prevention of incrustations on heating surfaces during the concentration, e.g. by elimination of the scale-forming substances contained in the liquors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="D21C11/12" definition-exists="false" ipc-concordant="D21C11/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Combustion of pulp liquors</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/122" definition-exists="false" ipc-concordant="D21C11/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/122</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Treatment, e.g. dissolution, of the smelt</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/125" definition-exists="false" ipc-concordant="D21C11/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Decomposition of the pulp liquors in reducing atmosphere or in the absence of oxidants, i.e. gasification or pyrolysis</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="D21C11/127" definition-exists="false" ipc-concordant="D21C11/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>D21C11/127</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with post-combustion of the gases</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="D21C11/14" definition-exists="false" ipc-concordant="D21C11/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>D21C11/14</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Wet combustion </text><CPC-specific-text><text>; Treatment of pulp liquors without previous evaporation, by oxidation of the liquors remaining at least partially in the liquid phase, e.g. by application or pressure </text><reference><text>oxidation of black, green or white liquors <class-ref scheme="cpc">D21C11/0057</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></class-scheme> |