D21C

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Description

PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR

Subclasses

SubclassTitle
1/00 Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02)
1/02 Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) with water or steam
1/04 Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) with acid reacting compounds
1/06 Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) with alkaline reacting compounds
1/08 Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) with oxygen-generating compounds
1/10 Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) Physical methods for facilitating impregnation
3/00 Pulping cellulose-containing materials (digesters D21C 7/00)
3/02 Pulping cellulose-containing materials (digesters D21C 7/00) with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
3/04 Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides
3/06 Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites
3/08 Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites calcium bisulfite
3/10 Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites magnesium bisulfite
3/12 Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sodium bisulfite
3/14 Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites ammonium bisulfite
3/16 Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides nitrogen oxides; nitric acid
3/18 Pulping cellulose-containing materials (digesters D21C 7/00) with halogens or halogen-generating compounds (bleaching cellulose pulp D21C 9/12)
3/20 Pulping cellulose-containing materials (digesters D21C 7/00) with organic solvents
3/22 Pulping cellulose-containing materials (digesters D21C 7/00) Other features of pulping processes
3/24 Pulping cellulose-containing materials (digesters D21C 7/00) Other features of pulping processes Continuous processes
3/26 Pulping cellulose-containing materials (digesters D21C 7/00) Other features of pulping processes Multi-stage processes

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