|
D21C 1/00
|
Pretreatment of the finely-divided materials before digesting |
|
D21C 1/02
|
Pretreatment of the finely-divided materials before digesting with water or steam |
|
D21C 1/04
|
Pretreatment of the finely-divided materials before digesting with acid reacting compounds |
|
D21C 1/06
|
Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds |
|
D21C 1/08
|
Pretreatment of the finely-divided materials before digesting with oxygen-generating compounds |
|
D21C 1/10
|
Physical methods for facilitating impregnation |
|
D21C 3/00
|
Pulping cellulose-containing materials |
|
D21C 3/02
|
Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes |
|
D21C 3/04
|
Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides |
|
D21C 3/06
|
Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides bisulfites |
|
D21C 3/08
|
Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides bisulfites calcium bisulfite |
|
D21C 3/10
|
Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides bisulfites magnesium bisulfite |
|
D21C 3/12
|
Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides bisulfites sodium bisulfite |
|
D21C 3/14
|
Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides bisulfites ammonium bisulfite |
|
D21C 3/16
|
Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides nitric acid |
|
D21C 3/18
|
Pulping cellulose-containing materials with halogens or halogen-generating compounds |
|
D21C 3/20
|
Pulping cellulose-containing materials with organic solvents |
|
D21C 3/22
|
Other features of pulping processes |
|
D21C 3/24
|
Continuous processes |
|
D21C 3/26
|
Multi-stage processes |
|
D21C 3/28
|
Prevention of foam |
|
D21C 5/00
|
Other processes for obtaining cellulose, e.g. cooking cotton linters |
|
D21C 5/02
|
Working-up waste paper |
|
D21C 7/00
|
Digesters |
|
D21C 7/02
|
Rotary digesters |
|
D21C 7/04
|
Linings |
|
D21C 7/06
|
Feeding devices |
|
D21C 7/08
|
Discharge devices |
|
D21C 7/10
|
Heating devices |
|
D21C 7/12
|
Devices for regulating or controlling |
|
D21C 7/14
|
Means for circulating the lye |
|
D21C 7/16
|
Safety devices |
|
D21C 9/00
|
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters |
|
D21C 9/02
|
Washing |
|
D21C 9/04
|
Washing in diffusers |
|
D21C 9/06
|
Washing in filters |
|
D21C 9/08
|
Removal of fats, resins, pitch, or waxes |
|
D21C 9/10
|
Bleaching |
|
D21C 9/12
|
Bleaching with halogens or halogen-containing compounds |
|
D21C 9/14
|
Bleaching with halogens or halogen-containing compounds with ClO2 or chlorites |
|
D21C 9/16
|
Bleaching with per compounds |
|
D21C 9/18
|
De-watering |
|
D21C 9/147
|
Bleaching with oxygen or its allotropic modifications |
|
D21C 9/153
|
Bleaching with oxygen or its allotropic modifications with ozone |
|
D21C 11/00
|
Regeneration of pulp liquors |
|
D21C 11/02
|
Regeneration of pulp liquors of sulfite lye |
|
D21C 11/04
|
Regeneration of pulp liquors of alkali lye |
|
D21C 11/06
|
Treatment of pulp gases; Recovery of the heat content of the gases |
|
D21C 11/08
|
Deodorisation |
|
D21C 11/10
|
Concentrating spent liquor by evaporation |
|
D21C 11/12
|
Combustion of pulp liquors |
|
D21C 11/14
|
Wet combustion |
