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1. (WO1997015714) BLEACHING SEQUENCE FOR CHEMICAL PAPER PULP INCLUDING SULPHONATING AND OXIDISING BLEACHING STAGES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/015714 International Application No.: PCT/SE1996/001295
Publication Date: 01.05.1997 International Filing Date: 11.10.1996
IPC:
D21C 9/10 (2006.01) ,D21C 9/147 (2006.01) ,D21C 9/16 (2006.01)
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10
Bleaching
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10
Bleaching
147
with oxygen or its allotropic modifications
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10
Bleaching
16
with per compounds
Applicants:
KVAERNER PULPING AB [SE/SE]; P.O. Box 1033 S-651 15 Karlstad, SE (AllExceptUS)
TIBBLING, Petter [SE/ID]; ID (UsOnly)
NILSSON, Erik [SE/SE]; SE (UsOnly)
Inventors:
TIBBLING, Petter; ID
NILSSON, Erik; SE
Agent:
KYLIN, Peter; Kvaerner Pulping AB P.O. Box 1033 S-651 15 Karlstad, SE
Priority Data:
9503764-426.10.1995SE
Title (EN) BLEACHING SEQUENCE FOR CHEMICAL PAPER PULP INCLUDING SULPHONATING AND OXIDISING BLEACHING STAGES
(FR) SEQUENCE DE BLANCHIMENT POUR LA PATE A PAPIER CHIMIQUE COMPRENANT DES ETAPES DE BLANCHIMENT PAR SULFONATION ET PAR OXYDATION
Abstract:
(EN) Method of bleaching chemical paper pulp, in a manner which is preferably entirely chlorine-free, in a bleaching sequence which includes at least one acidic, sulphite-containing, reducing bleaching stage, which bleaching stage is carried out, under conditions which are in the main sulphonating, to a degree of sulphonation which exceeds 10 %. One or two oxidising bleaching stages follow(s) directly thereafter, without intervening washes. If single, this oxidizing bleaching stage can be acidic or alkaline; if there are two oxidizing bleaching stages, the first can be acidic and the second alkaline.
(FR) La présente invention concerne un procédé de blanchiment de la pâte à papier chimique, de préférence sans aucune utilisation de chlore, dans une séquence de blanchiment qui comprend au moins une étape réductrice acide et comportant du sulfite. Cette étape est exécutée dans des conditions qui sont principalement sulfonantes, jusqu'à un degré de sulfonation dépassant 10 %. Une ou deux étapes d'oxydation suivent, immédiatement, sans qu'interviennent des lavages. S'il n'y a qu'une seule de ces étapes de blanchiment par oxydation, elle peut être acide ou alcaline. S'il y en a deux, la première peut être acide, la deuxième alcaline.
Designated States: BR, CA, JP, US
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)