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:
liberate, separate or purify a pre-existing compound or composition, or to
treat textiles or clean solid surfaces of materials
are further classified in subclass
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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
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D21C 5/02
)
P:20
D21C 3/00
Pulping cellulose-containing materials
(digesters
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D21C 7/00
)
P:30
D21C 5/00
Other processes for obtaining cellulose, e.g. cooking cotton linters
(obtaining fibres for spinning
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D01C
)
D21C 5/02
·
Working-up waste paper
(mechanical part
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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
(
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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