EP 0503303 B1 19951220 - Process for bleaching pulp in aliphatic monocarboxylic acids
Title (en)
Process for bleaching pulp in aliphatic monocarboxylic acids
Title (de)
Verfahren zum Bleichen von Zellstoffen in aliphatischen Monocarbonsäuren
Title (fr)
Procédé de blanchiment de pâtes avec acides aliphatiques monocarboxyliques
Publication
Application
Priority
DE 4107356 A 19910308
Abstract (en)
[origin: EP0503303A1] In this two-stage process for bleaching pulps, the pulp is bleached in a first stage in aliphatic monocarboxylic acids at an elevated temperature and under an elevated pressure, with addition of nitric acid. After washing or extraction with water or with the bleaching solution, a treatment of the pulp with an ozone-containing gas is carried out in the second stage.
IPC 1-7
IPC 8 full level
D21C 3/00 (2006.01); D21C 9/10 (2006.01); D21C 9/153 (2006.01)
CPC (source: EP)
D21C 3/003 (2013.01); D21C 9/1005 (2013.01); D21C 9/153 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0503303 A1 19920916; EP 0503303 B1 19951220; AT E131886 T1 19960115; CA 2062325 A1 19920909; DE 4107356 C1 19921105; DE 59204715 D1 19960201; FI 920832 A0 19920225; FI 920832 A 19920909; NO 920829 D0 19920303; NO 920829 L 19920909
DOCDB simple family (application)
EP 92102469 A 19920214; AT 92102469 T 19920214; CA 2062325 A 19920305; DE 4107356 A 19910308; DE 59204715 T 19920214; FI 920832 A 19920225; NO 920829 A 19920303