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1. WO1997030207 - PROCESS FOR BLEACHING OF CHEMICAL PULP

Publication Number WO/1997/030207
Publication Date 21.08.1997
International Application No. PCT/FI1997/000105
International Filing Date 19.02.1997
Chapter 2 Demand Filed 12.09.1997
IPC
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 9/16 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
16with per compounds
CPC
D21C 9/1042
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
1026Other features in bleaching processes
1042Use of chelating agents
D21C 9/16
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
16with per compounds
Applicants
  • KEMIRA CHEMICALS OY [FI]/[FI] (AllExceptUS)
  • RENVALL, Ilkka [FI]/[FI] (UsOnly)
  • SUOKAS, Elias [FI]/[FI] (UsOnly)
  • AKSELA, Reijo [FI]/[FI] (UsOnly)
  • PAREN, Aarto [FI]/[FI] (UsOnly)
Inventors
  • RENVALL, Ilkka
  • SUOKAS, Elias
  • AKSELA, Reijo
  • PAREN, Aarto
Agents
  • BERGGREN OY AB
Priority Data
96075519.02.1996FI
Publication Language English (EN)
Filing Language Finnish (FI)
Designated States
Title
(EN) PROCESS FOR BLEACHING OF CHEMICAL PULP
(FR) PROCEDE DE BLANCHIMENT DE PATE CHIMIQUE
Abstract
(EN)
A process for the bleaching or delignification of a chemical pulp with oxygen chemicals, in which process the pulp is treated with a chelating agent in order to bind into a chelate complex the heavy metals present in the pulp. The chelating agent used is a nitrogen-containing chelating agent and a mixture of one or more compounds according to Formula (I): R1CnHm(OH)p(COOH)qR2, in which formula n is 1-8, m is 0-2n, p is 0-n, q is 0-2, R1 is COOH, and R2 is H, CH2OH or COOH.
(FR)
La présente invention concerne un procédé de blanchiment ou de délignification de la pâte chimique consistant, au moyen d'un produit chimique à base d'oxygène à faire subir à la pâte un traitement au moyen d'un agent chélateur de façon à lier dans un complexe de chélates les éventuels métaux lourds présents dans la pâte. L'agent chélateur utilisé est constitué d'un agent de chélation azoté et d'un mélange de l'un ou de plusieurs des composés représentés dans la formule générale (I) suivante, à savoir R1CnHm(OH)p(COOH)qR2 dans laquelle n = 1 à 8, m = 0 à 2n, p =0 à n, q = 0 à 2, R1 est COOH et R2 est H, CH2OH ou COOH.
Also published as
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