BR0202504A - Reduction of organic chlorine formed during chlorine dioxide bleaching - Google Patents

Reduction of organic chlorine formed during chlorine dioxide bleaching

Info

Publication number
BR0202504A
BR0202504A BR0202504-3A BR0202504A BR0202504A BR 0202504 A BR0202504 A BR 0202504A BR 0202504 A BR0202504 A BR 0202504A BR 0202504 A BR0202504 A BR 0202504A
Authority
BR
Brazil
Prior art keywords
chlorine
aox
chlorine dioxide
bleaching
pulp
Prior art date
Application number
BR0202504-3A
Other languages
Portuguese (pt)
Inventor
Martin Ragnar
Ulla Ekstroem
Original Assignee
Kvaerner Pulping Tech
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=20283731&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=BR0202504(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kvaerner Pulping Tech filed Critical Kvaerner Pulping Tech
Publication of BR0202504A publication Critical patent/BR0202504A/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
    • 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
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)

Abstract

The invention relates to an improvement in bleaching of kraft pulp. In ECF bleaching chlorine dioxide is most often a prefered bleaching chemical in certain process positions. The disadvantage is that residual amounts of organically bound chlorine in form of AOX, i.e organically bound chlorine in effluents, and/or OCl, i.e. chlorine organically bound in the produced pulp, is obtained. A normal approach has been to reduce charges of chlorine dioxide. According to the invention could substantial reductions in AOX levels be obtained if the process conditions in the chlorine dioxide stage elevated to above 91 DEG C and extended to more than 90 minutes. A major reduction of AOX up to 50% have been shown without a corresponding increase in OCI. The chlorinated substances is degraded by the process conditions to harmless chloride ions, instead of being liberated into the effluent as AOX or bound to pulp as OCl. <IMAGE>
BR0202504-3A 2001-06-06 2002-06-06 Reduction of organic chlorine formed during chlorine dioxide bleaching BR0202504A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2001/001262 WO2002099186A1 (en) 2001-06-06 2001-06-06 Reduction of organically bound chlorine formed in chlorine dioxide bleaching

Publications (1)

Publication Number Publication Date
BR0202504A true BR0202504A (en) 2003-04-01

Family

ID=20283731

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0202504-3A BR0202504A (en) 2001-06-06 2002-06-06 Reduction of organic chlorine formed during chlorine dioxide bleaching

Country Status (6)

Country Link
EP (1) EP1270805B1 (en)
JP (1) JP2004522008A (en)
AT (1) ATE324485T1 (en)
BR (1) BR0202504A (en)
DE (1) DE60210867T2 (en)
WO (1) WO2002099186A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050051288A1 (en) * 2003-09-09 2005-03-10 Caifang Yin Extended retention and medium consistency pulp treatment
US8920603B2 (en) 2006-10-11 2014-12-30 Akzo Nobel N.V. Bleaching of pulp
BRPI0719893A2 (en) * 2006-10-11 2014-05-06 Akzo Nobel Nv PULP BLEACHING
CN112908423B (en) * 2021-01-07 2022-10-11 广西大学 Method for reducing AOX discharge amount in ECF bleaching process

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE334286B (en) * 1968-12-05 1971-04-19 Mo Och Domsjoe Ab
CA864409A (en) * 1969-04-14 1971-02-23 H. Andrews Douglas Pulp bleaching process
SE9000340L (en) * 1990-01-31 1991-08-01 Eka Nobel Ab PROCEDURES FOR BLACKING OF LIGNOCELLULOSALLY MATERIAL
SE506938C3 (en) * 1996-06-28 1998-04-20 Sunds Defibrator Ind Ab Pressurized chlorine dioxide bleaching with chlorine dioxide recovery
JPH1181173A (en) * 1997-09-01 1999-03-26 Oji Paper Co Ltd Production of bleached pulp
AU2822099A (en) * 1998-03-16 1999-10-11 Pulp And Paper Research Institute Of Canada Chlorine dioxide bleaching with additives
BR9901291B1 (en) * 1999-04-27 2011-11-01 process for bleaching low consistency chemical pulps.

Also Published As

Publication number Publication date
ATE324485T1 (en) 2006-05-15
DE60210867D1 (en) 2006-06-01
DE60210867T2 (en) 2007-05-10
EP1270805B1 (en) 2006-04-26
EP1270805A2 (en) 2003-01-02
JP2004522008A (en) 2004-07-22
EP1270805A3 (en) 2003-02-26
WO2002099186A1 (en) 2002-12-12

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Legal Events

Date Code Title Description
B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 7A E 8A ANUIDADE(S).

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 2055 DE 25/05/2010.