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

Note(s)

Processes using enzymes or micro-organisms in order to:

  1. liberate, separate or purify a pre-existing compound or composition, or to
  2. treat textiles or clean solid surfaces of materials
are further classified in subclass C12S.  [5]

 D21C
Subclass index
PRODUCTION OF CELLULOSE
Pretreatment of raw material 1/00
Pulping 3/00
Other processes 5/00
Digesters 7/00
AFTER-TREATMENT 9/00
REGENERATION OF PULP LIQUORS 11/00
P:50 D21C 1/00
Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02)
P:20 D21C 3/00
Pulping cellulose-containing materials (digesters D21C 7/00)
P:30 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 1/00)
P:40 D21C 7/00
Digesters
P:10 D21C 9/00
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
 D21C 9/10
·  Bleaching
 D21C 9/147
·  ·  with oxygen or its allotropic modifications (D21C 9/16 takes precedence)  [4]
 D21C 9/16
·  ·  with per compounds
P:0 D21C 11/00
Regeneration of pulp liquors
 D21C 11/12
·  Combustion of pulp liquors