IPC-Stelle: D21C 9/12 [Version 2006.01]

SymbolTypTitel
DSKSECTION D — TEXTILES; PAPER
D21USKPAPER
D21KLPAPER-MAKING; PRODUCTION OF CELLULOSE
D21CUKLPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
D21C 1/00HGRPretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02)
D21C 1/02UGR1
.with water or steam
D21C 1/04UGR1
.with acid reacting compounds
D21C 1/06UGR1
.with alkaline reacting compounds
D21C 1/08UGR1
.with oxygen-generating compounds
D21C 1/10UGR1
.Physical methods for facilitating impregnation
D21C 3/00HGRPulping cellulose-containing materials (digesters D21C 7/00)
D21C 3/02UGR1
.with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
D21C 3/04UGR1
.with acids, acid salts, or acid anhydrides
D21C 3/06UGR2
. .sulfur dioxide; sulfurous acid; bisulfites
D21C 3/08UGR3
. . .calcium bisulfite
D21C 3/10UGR3
. . .magnesium bisulfite
D21C 3/12UGR3
. . .sodium bisulfite
D21C 3/14UGR3
. . .ammonium bisulfite
D21C 3/16UGR2
. .nitrogen oxides; nitric acid
D21C 3/18UGR1
.with halogens or halogen-generating compounds (bleaching cellulose pulp D21C 9/12)
D21C 3/20UGR1
.with organic solvents
D21C 3/22UGR1
.Other features of pulping processes
D21C 3/24UGR2
. .Continuous processes
D21C 3/26UGR2
. .Multi-stage processes
D21C 3/28UGR2
. .Prevention of foam
D21C 5/00HGROther processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C)
D21C 5/02UGR1
.Working-up waste paper (mechanical part D21B 1/08, D21B 1/32)
D21C 7/00HGRDigesters
D21C 7/02UGR1
.Rotary digesters
D21C 7/04UGR1
.Linings
D21C 7/06UGR1
.Feeding devices
D21C 7/08UGR1
.Discharge devices
D21C 7/10UGR1
.Heating devices
D21C 7/12UGR1
.Devices for regulating or controlling
D21C 7/14UGR1
.Means for circulating the lye
D21C 7/16UGR1
.Safety devices
D21C 9/00HGRAfter-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
D21C 9/02UGR1
.Washing
D21C 9/04UGR2
. .in diffusers
D21C 9/06UGR2
. .in filters
D21C 9/08UGR1
.Removal of fats, resins, pitch, or waxes
D21C 9/10UGR1
.Bleaching
D21C 9/12UGR2
. .with halogens or halogen-containing compounds (D21C 9/16 takes precedence) [4]
D21C 9/14UGR3
. . .with ClO2 or chlorites
D21C 9/147UGR2
. .with oxygen or its allotropic modifications (D21C 9/16 takes precedence) [4]
D21C 9/153UGR3
. . .with ozone [4]
D21C 9/16UGR2
. .with per compounds
D21C 9/18UGR1
.De-watering (de-watering in general F26B)
D21C 11/00HGRRegeneration of pulp liquors
D21C 11/02UGR1
.of sulfite lye
D21C 11/04UGR1
.of alkali lye
D21C 11/06UGR1
.Treatment of pulp gases; Recovery of the heat content of the gases
D21C 11/08UGR2
. .Deodorisation
D21C 11/10UGR1
.Concentrating spent liquor by evaporation (evaporators B01D)
D21C 11/12UGR1
.Combustion of pulp liquors
D21C 11/14UGR2
. .Wet combustion