EP 0213376 B1 19901010 - PROCESS FOR THE DELIGNIFICATION OF CELLULOSIC MATERIALS
Title (en)
PROCESS FOR THE DELIGNIFICATION OF CELLULOSIC MATERIALS
Publication
Application
Priority
US 76272485 A 19850805
Abstract (en)
[origin: EP0213376A1] 1. Process for the delignification of cellulosic materials characterized in that in a first step the cellulosic materials are treated with an acid under regulated conditions to effect a decontamination of the cellulosic material of the metals which they contain, in a second step the cellulosic materials of the first step are treated with hydrogen peroxyde under alcaline conditions and in a third step the cellulosic materials of the second step are boiled in the presence of sulphite or sulphate.
IPC 1-7
IPC 8 full level
D21C 1/00 (2006.01); D21C 1/04 (2006.01); D21C 1/08 (2006.01); D21C 3/02 (2006.01); D21C 3/22 (2006.01); D21C 3/26 (2006.01)
CPC (source: EP)
D21C 3/26 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0213376 A1 19870311; EP 0213376 B1 19901010; AT E57401 T1 19901015; AU 591508 B2 19891207; AU 6054386 A 19870212; BR 8603671 A 19870310; CA 1282911 C 19910416; DE 3674866 D1 19901115; ES 2000831 A6 19880316; FI 85725 B 19920214; FI 85725 C 19920525; FI 863193 A0 19860805; FI 863193 A 19870206; IN 167959 B 19910112; JP H0742669 B2 19950510; JP S6297991 A 19870507; NO 168375 B 19911104; NO 168375 C 19920212; NO 863132 D0 19860804; NO 863132 L 19870206; NZ 217001 A 19890127; PT 83117 A 19860901; PT 83117 B 19881014; YU 137086 A 19871031; YU 45352 B 19920528
DOCDB simple family (application)
EP 86110249 A 19860725; AT 86110249 T 19860725; AU 6054386 A 19860725; BR 8603671 A 19860804; CA 515198 A 19860801; DE 3674866 T 19860725; ES 8600839 A 19860804; FI 863193 A 19860805; IN 647DE1986 A 19860718; JP 18326186 A 19860804; NO 863132 A 19860804; NZ 21700186 A 19860728; PT 8311786 A 19860801; YU 137086 A 19860731