| IPC 7 English version |
| D21C-D21C01114 |
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| SECTION D – TEXTILES; PAPER |
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| D 21 | PAPER-MAKING; PRODUCTION OF CELLULOSE |
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| D 21 C | PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR |
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| Note |
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| Processes using enzymes or micro-organisms in order to: |
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| (i) | liberate, separate or purify a pre-existing compound or composition, or to |
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| (ii) | treat textiles or clean solid surfaces of materials |
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| are further classified in subclass C12S. [5] |
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| Subclass Index |
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| PRODUCTION OF CELLULOSE |
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| Pretreatment of raw material |
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| Pulping |
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| Other processes |
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| Digesters |
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| AFTER-TREATMENT |
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| REGENERATION OF PULP LIQUORS |
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1/ | 00 | Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) |
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1/ | 02 | . | with water or steam |
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1/ | 04 | . | with acid reacting compounds |
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1/ | 06 | . | with alkaline reacting compounds |
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1/ | 08 | . | with oxygen-generating compounds |
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1/ | 10 | . | Physical methods for facilitating impregnation |
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3/ | 00 | Pulping cellulose-containing materials (digesters D21C 7/00) |
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3/ | 02 | . | with inorganic bases or alkaline reacting compounds, e.g. sulfate processes |
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3/ | 04 | . | with acids, acid salts, or acid anhydrides |
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3/ | 06 | . | . | sulfur dioxide; sulfurous acid; bisulfites |
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3/ | 08 | . | . | . | calcium bisulfite |
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3/ | 10 | . | . | . | magnesium bisulfite |
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3/ | 12 | . | . | . | sodium bisulfite |
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3/ | 14 | . | . | . | ammonium bisulfite |
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3/ | 16 | . | . | nitrogen oxides; nitric acid |
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3/ | 18 | . | with halogens or halogen-generating compounds (bleaching cellulose pulp D21C 9/12) |
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3/ | 20 | . | with organic solvents |
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3/ | 22 | . | Other features of pulping processes |
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3/ | 24 | . | . | Continuous processes |
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3/ | 26 | . | . | Multi-stage processes |
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3/ | 28 | . | . | Prevention of foam |
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5/ | 00 | Other processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C) |
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5/ | 02 | . | Working-up waste paper (mechanical part D21B 1/08, D21B 1/32) |
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7/ | 00 | Digesters |
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7/ | 02 | . | Rotary digesters |
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7/ | 04 | . | Linings |
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7/ | 06 | . | Feeding devices |
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7/ | 08 | . | Discharge devices |
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7/ | 10 | . | Heating devices |
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7/ | 12 | . | Devices for regulating or controlling |
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7/ | 14 | . | Means for circulating the lye |
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7/ | 16 | . | Safety devices |
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9/ | 00 | After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters |
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9/ | 02 | . | Washing |
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9/ | 04 | . | . | in diffusers |
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9/ | 06 | . | . | in filters |
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9/ | 08 | . | Removal of fats, resins, pitch, or waxes |
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9/ | 10 | . | Bleaching |
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9/ | 12 | . | . | with halogens or halogen-containing compounds (D21C 9/16 takes precedence) [4] |
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9/ | 14 | . | . | . | with ClO2 or chlorites |
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9/ | 147 | . | . | with oxygen or its allotropic modifications (D21C 9/16 takes precedence) [4] |
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9/ | 153 | . | . | . | with ozone [4] |
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9/ | 16 | . | . | with per compounds |
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9/ | 18 | . | De-watering (de-watering in general F26B) |
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11/ | 00 | Regeneration of pulp liquors |
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11/ | 02 | . | of sulfite lye |
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11/ | 04 | . | of alkali lye |
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11/ | 06 | . | Treatment of pulp gases; Recovery of the heat content of the gases |
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11/ | 08 | . | . | Deodorisation |
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11/ | 10 | . | Concentrating spent liquor by evaporation (evaporators B01D) |
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11/ | 12 | . | Combustion of pulp liquors |
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11/ | 14 | . | . | Wet combustion |
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