CA2264423A1 - Method for treatment of pulp - Google Patents

Method for treatment of pulp Download PDF

Info

Publication number
CA2264423A1
CA2264423A1 CA002264423A CA2264423A CA2264423A1 CA 2264423 A1 CA2264423 A1 CA 2264423A1 CA 002264423 A CA002264423 A CA 002264423A CA 2264423 A CA2264423 A CA 2264423A CA 2264423 A1 CA2264423 A1 CA 2264423A1
Authority
CA
Canada
Prior art keywords
pulp
chlorine dioxide
treatment
react
treated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002264423A
Other languages
French (fr)
Other versions
CA2264423C (en
Inventor
Tapani Vuorinen
Sari Juutilainen
Aki Vilpponen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz Oy
Original Assignee
Andritz Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8551173&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2264423(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Andritz Oy filed Critical Andritz Oy
Publication of CA2264423A1 publication Critical patent/CA2264423A1/en
Application granted granted Critical
Publication of CA2264423C publication Critical patent/CA2264423C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites

Abstract

The present invention relates to a method for treatment of pulp in an alkaline pulping process of chemical pulp. The pulp is treated in a chlorine dioxide stage comprising successive preferably a chlorine dioxide step and an acid treatment step at a pH of 2 - 5 and a temperature of over 80°C. The conditions in the chlorine dioxide step are such that the hexenuronic acid groups in the pulp do not react with chlorine dioxide.
CA002264423A 1998-03-06 1999-03-05 Method for treatment of pulp Expired - Fee Related CA2264423C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI980519 1998-03-06
FI980519A FI119383B (en) 1998-03-06 1998-03-06 Procedure for treating pulp

Publications (2)

Publication Number Publication Date
CA2264423A1 true CA2264423A1 (en) 1999-09-06
CA2264423C CA2264423C (en) 2003-01-28

Family

ID=8551173

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002264423A Expired - Fee Related CA2264423C (en) 1998-03-06 1999-03-05 Method for treatment of pulp

Country Status (7)

Country Link
US (1) US20020056533A1 (en)
EP (1) EP0940498B1 (en)
CA (1) CA2264423C (en)
DE (1) DE69931295D1 (en)
ES (1) ES2263236T3 (en)
FI (1) FI119383B (en)
PT (1) PT940498E (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE524896C2 (en) * 2003-03-07 2004-10-19 Kvaerner Pulping Tech Bleaching of cellulose pulp with chlorine dioxide in two phases with heating between the phases
US20060201642A1 (en) * 2005-03-08 2006-09-14 Andritz Inc. Methods of treating chemical cellulose pulp
US8920603B2 (en) 2006-10-11 2014-12-30 Akzo Nobel N.V. Bleaching of pulp
ES2403371T3 (en) * 2006-10-11 2013-05-17 Akzo Nobel N.V. Paper Pulp Bleaching

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5268075A (en) * 1989-10-19 1993-12-07 North Carolina State University High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process
FI102301B1 (en) * 1994-10-13 1998-11-13 Ahlstrom Machinery Oy Process for treating cellulose pulp
US6776876B1 (en) * 1994-10-13 2004-08-17 Andritz Oy Method of treating cellulosic pulp to remove hexenuronic acid
FI105701B (en) * 1995-10-20 2000-09-29 Ahlstrom Machinery Oy Method and arrangement for treatment of pulp

Also Published As

Publication number Publication date
EP0940498B1 (en) 2006-05-17
CA2264423C (en) 2003-01-28
EP0940498A1 (en) 1999-09-08
PT940498E (en) 2006-09-29
US20020056533A1 (en) 2002-05-16
FI119383B (en) 2008-10-31
DE69931295D1 (en) 2006-06-22
ES2263236T3 (en) 2006-12-01
FI980519A0 (en) 1998-03-06
FI980519A (en) 1999-09-07

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