D
SECTION D — TEXTILES; PAPER
  
PAPER
 D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
 D21C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
 D21C 1/00
Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02)
 D21C 1/02
·  with water or steam
 D21C 1/04
·  with acid reacting compounds
 D21C 1/06
·  with alkaline reacting compounds
 D21C 1/08
·  with oxygen-generating compounds
 D21C 1/10
·  Physical methods for facilitating impregnation
 D21C 3/00
Pulping cellulose-containing materials (digesters D21C 7/00)
 D21C 3/02
·  with inorganic bases or alkaline reacting compounds, e.g. sulphate processes
 D21C 3/04
·  with acids, acid salts, or acid anhydrides
 D21C 3/06
·  ·  sulphur dioxide; sulphurous acid; bisulphites
 D21C 3/08
·  ·  ·  calcium bisulphite
 D21C 3/10
·  ·  ·  magnesium bisulphite
 D21C 3/12
·  ·  ·  sodium bisulphite
 D21C 3/14
·  ·  ·  ammonium bisulphite
 D21C 3/16
·  ·  nitrogen oxides; nitric acid
 D21C 3/18
·  with halogens or halogen-generating compounds (bleaching cellulose pulp D21C 9/12)
 D21C 3/20
·  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 (obtaining fibres for spinning D01C)
 D21C 5/02
·  Working-up waste paper (mechanical part D21B 1/08, D21B 1/32)
 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 or cotton linters
 D21C 9/02
·  Washing
 D21C 9/04
·  ·  in diffusers
 D21C 9/06
·  ·  in filters
 D21C 9/08
·  Removal of fats, resins, pitch, or waxes
 D21C 9/10
·  Bleaching
 D21C 9/12
·  ·  with halogens or halogen-containing compounds (D21C 9/16 takes precedence)
 D21C 9/14
·  ·  ·  with ClO2 or chlorites
 D21C 9/147
·  ·  with oxygen or its allotropic modifications (D21C 9/16 takes precedence)  [4]
 D21C 9/153
·  ·  ·  with ozone  [4]
 D21C 9/16
·  ·  with per compounds
 D21C 9/18
·  De-watering (de-watering in general F26B)
 D21C 11/00
Regeneration of pulp liquors
 D21C 11/02
·  of sulphite lye
 D21C 11/04
·  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 (evaporators B01D)
 D21C 11/12
·  Combustion of pulp liquors
 D21C 11/14
·  ·  Wet combustion