D | SK | TEXTILES; PAPER |
D21 | USK | PAPER |
D21 | KL | PAPER-MAKING; PRODUCTION OF CELLULOSE |
D21C | UKL | PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR |
D21C 1/00 | HGR | Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) [1, 2006.01] |
D21C 1/02 | UGR1 | . | with water or steam [1, 2006.01] |
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D21C 1/04 | UGR1 | . | with acid reacting compounds [1, 2006.01] |
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D21C 1/06 | UGR1 | . | with alkaline reacting compounds [1, 2006.01] |
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D21C 1/08 | UGR1 | . | with oxygen-generating compounds [1, 2006.01] |
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D21C 1/10 | UGR1 | . | Physical methods for facilitating impregnation [1, 2006.01] |
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D21C 3/00 | HGR | Pulping cellulose-containing materials [1, 2006.01] |
D21C 3/02 | UGR1 | . | with inorganic bases or alkaline reacting compounds, e.g. sulfate processes [1, 2006.01] |
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D21C 3/04 | UGR1 | . | with acids, acid salts, or acid anhydrides [1, 2006.01] |
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D21C 3/06 | UGR2 | . . | sulfur dioxide; sulfurous acid; bisulfites [1, 2006.01] |
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D21C 3/08 | UGR3 | . . . | calcium bisulfite [1, 2006.01] |
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D21C 3/10 | UGR3 | . . . | magnesium bisulfite [1, 2006.01] |
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D21C 3/12 | UGR3 | . . . | sodium bisulfite [1, 2006.01] |
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D21C 3/14 | UGR3 | . . . | ammonium bisulfite [1, 2006.01] |
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D21C 3/16 | UGR2 | . . | nitrogen oxides; nitric acid [1, 2006.01] |
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D21C 3/18 | UGR1 | . | with halogens or halogen-generating compounds (bleaching cellulose pulp D21C 9/12) [1, 2006.01] |
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D21C 3/20 | UGR1 | . | with organic solvents [1, 2006.01] |
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D21C 3/22 | UGR1 | . | Other features of pulping processes [1, 2006.01] |
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D21C 3/24 | UGR2 | . . | Continuous processes [1, 2006.01] |
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D21C 3/26 | UGR2 | . . | Multi-stage processes [1, 2006.01] |
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D21C 3/28 | UGR2 | . . | Prevention of foam [1, 2006.01] |
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D21C 5/00 | HGR | Other processes for obtaining cellulose, e.g. cooking cotton linters [1, 2006.01] |
D21C 5/02 | UGR1 | . | Working-up waste paper (mechanical processes for working-up waste paper D21B 1/08, D21B 1/32) [1, 2006.01] |
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D21C 7/00 | HGR | Digesters [1, 2006.01] |
D21C 7/02 | UGR1 | . | Rotary digesters [1, 2006.01] |
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D21C 7/04 | UGR1 | |
D21C 7/06 | UGR1 | . | Feeding devices [1, 2006.01] |
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D21C 7/08 | UGR1 | . | Discharge devices [1, 2006.01] |
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D21C 7/10 | UGR1 | . | Heating devices [1, 2006.01] |
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D21C 7/12 | UGR1 | . | Devices for regulating or controlling [1, 2006.01] |
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D21C 7/14 | UGR1 | . | Means for circulating the lye [1, 2006.01] |
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D21C 7/16 | UGR1 | . | Safety devices [1, 2006.01] |
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D21C 9/00 | HGR | After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters [1, 2006.01] |
D21C 9/02 | UGR1 | |
D21C 9/04 | UGR2 | . . | in diffusers [1, 2006.01] |
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D21C 9/06 | UGR2 | . . | in filters [1, 2006.01] |
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D21C 9/08 | UGR1 | . | Removal of fats, resins, pitch, or waxes [1, 2006.01] |
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D21C 9/10 | UGR1 | |
D21C 9/12 | UGR2 | . . | with halogens or halogen-containing compounds (D21C 9/16 takes precedence) [1, 4, 2006.01] |
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D21C 9/14 | UGR3 | . . . | with ClO2 or chlorites [1, 2006.01] |
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D21C 9/147 | UGR2 | . . | with oxygen or its allotropic modifications (D21C 9/16 takes precedence) [4, 2006.01] |
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D21C 9/153 | UGR3 | . . . | with ozone [4, 2006.01] |
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D21C 9/16 | UGR2 | . . | with per compounds [1, 2006.01] |
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D21C 9/18 | UGR1 | . | De-watering [1, 2006.01] |
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D21C 11/00 | HGR | Regeneration of pulp liquors [1, 2006.01] |
D21C 11/02 | UGR1 | . | of sulfite lye [1, 2006.01] |
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D21C 11/04 | UGR1 | . | of alkali lye [1, 2006.01] |
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D21C 11/06 | UGR1 | . | Treatment of pulp gases; Recovery of the heat content of the gases [1, 2006.01] |
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D21C 11/08 | UGR2 | . . | Deodorisation [1, 2006.01] |
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D21C 11/10 | UGR1 | . | Concentrating spent liquor by evaporation [1, 2006.01] |
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D21C 11/12 | UGR1 | . | Combustion of pulp liquors [1, 2006.01] |
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D21C 11/14 | UGR2 | . . | Wet combustion [1, 2006.01] |
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