NO20091815L - Bleaching of wood pulp - Google Patents

Bleaching of wood pulp

Info

Publication number
NO20091815L
NO20091815L NO20091815A NO20091815A NO20091815L NO 20091815 L NO20091815 L NO 20091815L NO 20091815 A NO20091815 A NO 20091815A NO 20091815 A NO20091815 A NO 20091815A NO 20091815 L NO20091815 L NO 20091815L
Authority
NO
Norway
Prior art keywords
chlorine dioxide
bleaching
wood pulp
relates
cellulose pulp
Prior art date
Application number
NO20091815A
Other languages
Norwegian (no)
Inventor
Thomas Christopher Greschik
Magnus Bjorklund
Hakan Fagersten
Original Assignee
Akzo Nobel Nv
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=37807769&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=NO20091815(L) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Akzo Nobel Nv filed Critical Akzo Nobel Nv
Publication of NO20091815L publication Critical patent/NO20091815L/en

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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/142—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 in a multistage process involving ClO2/Cl2 exclusively

Abstract

Den foreliggende oppfinnelse vedrører en fremgangsmåte for bleking av cellulosemasse avledet fra en alkalisk kokeprosess med et heksenuronsyreinnhold før det endelige bleketrinn på fra omtrent 1 til omtrent 80 mmol/kg tørr masse, idet fremgangsmåten omfatter tre klordioksidtrinn D0, D1 og D2, hvori klordioksidtilførslene basert på den totale klordioksidtilførsel i a) D0 er fra omtrent 40 til omtrent 60 %; b) D1 er fra omtrent 30 til omtrent 55 %; c) D2 er fra omtrent 40 til omtrent 20 %, og hvori det endelige klordioksidtrinn D2 utføres ved en pH på fra omtrent 2 til omtrent 4,5. Oppfinnelsen vedrører også bleket cellulosemasse som kan oppnås ved hjelp av prosessen.The present invention relates to a process for bleaching cellulose pulp derived from an alkaline boiling process having a hexenuronic acid content prior to the final bleaching stage of from about 1 to about 80 mmol / kg dry mass, the process comprising three chlorine dioxide stages D0, D1 and D2, wherein the chlorine dioxide feeds are based the total chlorine dioxide supply ia) D0 is from about 40 to about 60%; b) D1 is from about 30 to about 55%; c) D2 is from about 40 to about 20% and wherein the final chlorine dioxide step D2 is carried out at a pH of from about 2 to about 4.5. The invention also relates to bleached cellulose pulp which can be obtained by the process.

NO20091815A 2006-10-11 2009-05-08 Bleaching of wood pulp NO20091815L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06122119 2006-10-11
PCT/SE2007/050630 WO2008044988A1 (en) 2006-10-11 2007-09-06 Bleaching of pulp

Publications (1)

Publication Number Publication Date
NO20091815L true NO20091815L (en) 2009-07-10

Family

ID=37807769

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20091815A NO20091815L (en) 2006-10-11 2009-05-08 Bleaching of wood pulp

Country Status (12)

Country Link
EP (1) EP2082096B1 (en)
AR (1) AR063160A1 (en)
BR (1) BRPI0719893A2 (en)
CA (1) CA2665969C (en)
CL (1) CL2007002906A1 (en)
EA (1) EA013901B1 (en)
ES (1) ES2403371T3 (en)
NO (1) NO20091815L (en)
PT (1) PT2082096E (en)
UY (1) UY30634A1 (en)
WO (1) WO2008044988A1 (en)
ZA (1) ZA200903205B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20105862A0 (en) 2010-08-18 2010-08-18 Bo Akademi University METHOD FOR REMOVING HEXENURURIC ACIDS
WO2015018908A1 (en) 2013-08-09 2015-02-12 Novozymes A/S Reducing content of hexenuronic acids in cellulosic pulp

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501374A (en) * 1968-12-26 1970-03-17 Hooker Chemical Corp Sequential bleaching of kraft pulp with chlorine dioxide and chlorine
US5268075A (en) * 1989-10-19 1993-12-07 North Carolina State University High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process
US5030324A (en) * 1990-01-29 1991-07-09 Champion International Corporation Sequential bleaching procedure using chlorine and chlorine dioxide in a first chlorination stage of a multistage bleaching process
US6776876B1 (en) * 1994-10-13 2004-08-17 Andritz Oy Method of treating cellulosic pulp to remove hexenuronic acid
FI119383B (en) * 1998-03-06 2008-10-31 Andritz Oy Procedure for treating pulp
JP2004522008A (en) * 2001-06-06 2004-07-22 クヴアナ・パルピング・アクチボラグ Reduction of organically bound chlorine formed by chlorine dioxide bleaching
US20060201642A1 (en) * 2005-03-08 2006-09-14 Andritz Inc. Methods of treating chemical cellulose pulp

Also Published As

Publication number Publication date
EA013901B1 (en) 2010-08-30
ES2403371T3 (en) 2013-05-17
BRPI0719893A2 (en) 2014-05-06
CA2665969A1 (en) 2008-04-17
EP2082096B1 (en) 2013-02-20
UY30634A1 (en) 2007-11-30
EA200970367A1 (en) 2009-08-28
PT2082096E (en) 2013-04-26
ZA200903205B (en) 2010-03-31
CA2665969C (en) 2016-04-12
AR063160A1 (en) 2008-12-30
WO2008044988A1 (en) 2008-04-17
EP2082096A1 (en) 2009-07-29
CL2007002906A1 (en) 2008-05-02

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Legal Events

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