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1. (WO1997019222) NEUTRAL MONOPEROXYSULFATE BLEACHING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/019222 International Application No.: PCT/US1996/018617
Publication Date: 29.05.1997 International Filing Date: 15.11.1996
Chapter 2 Demand Filed: 16.06.1997
IPC:
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
16
with per compounds
Applicants:
INTERNATIONAL PAPER COMPANY [US/US]; 2 Manhattanville Road Purchase, NY 10577-2196, US
Inventors:
LAM, Jamshed, N.; US
YASNOVSKY, Vacheslav, M.; US
BHATTACHARJEE, Shyam, S.; US
Agent:
GRAHAM, Mark, S.; Luedeka, Neely & Graham, P.C. P.O. Box 1871 Knoxville, TN 37901 , US
Priority Data:
08/572,14717.11.1995US
Title (EN) NEUTRAL MONOPEROXYSULFATE BLEACHING
(FR) BLANCHIMENT AU MOYEN DE MONOPEROXYSULFATE NEUTRE
Abstract:
(EN) The invention described herein relates to an elemental chlorine-free method for the delignification and bleaching of pulp which involves the use of a neutral monoperoxysulfate bleaching step to delignify and thus brighten the pulp. The process achieves good selectivities above about 3 even at high delignification degrees of 60 % of greater.
(FR) L'invention concerne un procédé élémentaire exempt de chlore servant à effectuer la délignification et le blanchiment de pâte de cellulose et consistant à mettre en application une étape de blanchiment au moyen d'un monoperoxysulfate neutre, afin de délignifier et, par conséquent, d'éclaircir la pâte de cellulose. Ce procédé permet d'atteindre une sélectivité supérieure à 3 même dans le cas de degrés de délignification élevés égaux ou supérieurs à 60 %.
Designated States: AU, NO
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)
Also published as:
NO19982228EP0861348AU1997010566