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1. WO1996002697 - IMPROVED BLEACHING OF HIGH CONSISTENCY LIGNOCELLULOSIC PULP

Publication Number WO/1996/002697
Publication Date 01.02.1996
International Application No. PCT/US1995/008691
International Filing Date 11.07.1995
Chapter 2 Demand Filed 06.02.1996
IPC
D21C 9/00 2006.01
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
D21C 9/10 2006.01
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10Bleaching
D21C 9/153 2006.01
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10Bleaching
147with oxygen or its allotropic modifications
153with ozone
CPC
D21C 9/007
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
001Modification of pulp properties
007by mechanical or physical means
D21C 9/1005
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
10Bleaching ; ; Apparatus therefor
1005Pretreatment of the pulp, e.g. degassing the pulp
D21C 9/153
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
10Bleaching ; ; Apparatus therefor
147with oxygen or its allotropic modifications
153with ozone
Applicants
  • UNION CAMP PATENT HOLDING, INC. [US/US]; 1600 Valley Road Wayne, NJ 07470, US
Inventors
  • GANDEK, Thomas, P.; US
Agents
  • NATH, Gary, M.; 1835 K Street, N.W. Suite 750 Washington, DC 20006-1203, US
Priority Data
08/275,09514.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) IMPROVED BLEACHING OF HIGH CONSISTENCY LIGNOCELLULOSIC PULP
(FR) BLANCHIMENT AMELIORE D'UNE PATE LIGNOCELLULOSIQUE TRES CONCENTREE
Abstract
(EN)
The present invention pertains to a method having increased selectivity for bleaching lignocellulosic pulp having a high consistency from a first GE brightness to a second, higher GE brightness which comprises the steps of (a) fluffing the high consistency pulp having the first GE brightness to a specific surface area of at least about 90 m2/kg; and (b) contacting the fluffed pulp with a gaseous bleaching agent to form a bleached pulp having the second, higher GE brightness, wherein the pulp fluffing in step (a) and the pulp bleaching in step (b) are carried out substantially simultaneously. The present invention also pertains to a bleached lignocellulosic pulp prepared by the method of the present invention.
(FR)
La présente invention concerne un procédé plus sélectif de blanchiment d'une pâte lignocellulosique très concentrée pour l'amener d'un premier degré de blanc GE à un second degré de blanc GE plus élevé. Ce procédé consiste (a) à désagréger la pâte très concentrée ayant le premier degré de blanc GE pour avoir une surface spécifique d'au moins 90 m2/kg environ; et (b) à mettre en contact la pâte désagrégée avec un agent de blanchiment gazeux pour former une pâte blanchie ayant un second degré de blanc GE plus élevé. Dans ce procédé, la désagrégation de la pâte de l'étape (a) et le blanchiment de la pâte de l'étape (b) se font sensiblement en même temps. La présente invention concerne également une pâte lignocellulosique blanchie préparée par le procédé de la présente invention.
Also published as
FI965216
Latest bibliographic data on file with the International Bureau