EP 0446110 B1 19950712 - Process for producing bleached high-yield pulps.
Title (en)
Process for producing bleached high-yield pulps.
Title (de)
Verfahren zur Herstellung von gebleichtem Zellstoff mit hoher Ausbeute.
Title (fr)
Procédé de préparation de pâtes à haut rendement blanchies.
Publication
Application
Priority
FR 9003128 A 19900307
Abstract (en)
[origin: EP0446110A1] Process for the manufacture of high-yield pulps bleached with the aid of hydrogen peroxide in alkaline medium, which consists in subjecting the pulp to be bleached successively: . to a pretreatment with the aid of a sequestering agent for metal ions, followed by a washing, . to a treatment with sulphite and a reducing agent which is more electronegative than the sulphite ion which function together and in a medium with an initial pH of between 7 and 12.5, followed by a washing to remove the sulphite ions and the reducing agent, . to a bleaching treatment with the aid of hydrogen peroxide in alkaline medium in the presence of a quantity of silicate of between 0 % and 1 %.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
D21C 9/1042 (2013.01 - EP US); D21C 9/1057 (2013.01 - EP US); D21C 9/1084 (2013.01 - EP US); D21C 9/163 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0446110 A1 19910911; EP 0446110 B1 19950712; AT E125013 T1 19950715; AU 641478 B2 19930923; AU 7266891 A 19910912; CA 2037678 A1 19910908; CA 2037678 C 19991116; DE 69111098 D1 19950817; DE 69111098 T2 19951123; ES 2074670 T3 19950916; FI 911118 A0 19910306; FI 911118 A 19910908; FI 98840 B 19970515; FI 98840 C 19970825; FR 2659363 A1 19910913; FR 2659363 B1 19960419; JP H04214491 A 19920805; JP H0660474 B2 19940810; NO 178899 B 19960318; NO 178899 C 19960626; NO 910865 D0 19910305; NO 910865 L 19910909; NZ 237310 A 19930727; PT 96951 A 19911031; PT 96951 B 19981030; US 5143581 A 19920901
DOCDB simple family (application)
EP 91400567 A 19910301; AT 91400567 T 19910301; AU 7266891 A 19910306; CA 2037678 A 19910306; DE 69111098 T 19910301; ES 91400567 T 19910301; FI 911118 A 19910306; FR 9003128 A 19900307; JP 6797891 A 19910307; NO 910865 A 19910305; NZ 23731091 A 19910305; PT 9695191 A 19910306; US 66553191 A 19910306