EP1270805A3 - Reduction of organically bound chlorine formed in chlorine dioxide bleaching - Google Patents

Reduction of organically bound chlorine formed in chlorine dioxide bleaching Download PDF

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Publication number
EP1270805A3
EP1270805A3 EP02076282A EP02076282A EP1270805A3 EP 1270805 A3 EP1270805 A3 EP 1270805A3 EP 02076282 A EP02076282 A EP 02076282A EP 02076282 A EP02076282 A EP 02076282A EP 1270805 A3 EP1270805 A3 EP 1270805A3
Authority
EP
European Patent Office
Prior art keywords
chlorine
aox
organically bound
chlorine dioxide
bleaching
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
EP02076282A
Other languages
German (de)
French (fr)
Other versions
EP1270805B1 (en
EP1270805A2 (en
Inventor
Martin Ragnar
Ulla EKSTRÖM
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.)
Flsmidth Dorr Oliver Eimco Management Hungary Kft Luxembourg Branch
Original Assignee
Kvaerner Pulping AB
Kvaerner Pulping Technologies AB
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=EP1270805(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kvaerner Pulping AB, Kvaerner Pulping Technologies AB filed Critical Kvaerner Pulping AB
Publication of EP1270805A2 publication Critical patent/EP1270805A2/en
Publication of EP1270805A3 publication Critical patent/EP1270805A3/en
Application granted granted Critical
Publication of EP1270805B1 publication Critical patent/EP1270805B1/en
Anticipated expiration legal-status Critical
Revoked 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
    • D21C9/12—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>
EP02076282A 2001-06-06 2002-04-03 Reduction of organically bound chlorine formed in chlorine dioxide bleaching Revoked EP1270805B1 (en)

Applications Claiming Priority (2)

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
WOPCT/SE01/01262 2001-06-06

Publications (3)

Publication Number Publication Date
EP1270805A2 EP1270805A2 (en) 2003-01-02
EP1270805A3 true EP1270805A3 (en) 2003-02-26
EP1270805B1 EP1270805B1 (en) 2006-04-26

Family

ID=20283731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02076282A Revoked EP1270805B1 (en) 2001-06-06 2002-04-03 Reduction of organically bound chlorine formed in 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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622444A (en) * 1969-04-14 1971-11-23 Canadian Ind Pulp bleaching process
US3652388A (en) * 1968-12-05 1972-03-28 Mo Och Domsjoe Ab Bleaching and delignification of partially delignified pulp with a mixture of chlorine and chlorine dioxide
EP0500813B1 (en) * 1990-01-31 1994-12-07 Eka Chemicals AB Process for bleaching of ligno-cellulosic material
WO1998000602A1 (en) * 1996-06-28 1998-01-08 Sunds Defibrator Industries Ab Pressurized chlorine dioxide bleaching with recovery of chlorine dioxide
US6235154B1 (en) * 1998-03-16 2001-05-22 Pulp And Paper Research Institute Of Canada Chlorine dioxide bleaching in the presence of an aldehyde

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1181173A (en) * 1997-09-01 1999-03-26 Oji Paper Co Ltd Production of bleached pulp
BR9901291B1 (en) * 1999-04-27 2011-11-01 process for bleaching low consistency chemical pulps.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3652388A (en) * 1968-12-05 1972-03-28 Mo Och Domsjoe Ab Bleaching and delignification of partially delignified pulp with a mixture of chlorine and chlorine dioxide
US3622444A (en) * 1969-04-14 1971-11-23 Canadian Ind Pulp bleaching process
EP0500813B1 (en) * 1990-01-31 1994-12-07 Eka Chemicals AB Process for bleaching of ligno-cellulosic material
WO1998000602A1 (en) * 1996-06-28 1998-01-08 Sunds Defibrator Industries Ab Pressurized chlorine dioxide bleaching with recovery of chlorine dioxide
US6235154B1 (en) * 1998-03-16 2001-05-22 Pulp And Paper Research Institute Of Canada Chlorine dioxide bleaching in the presence of an aldehyde

Also Published As

Publication number Publication date
ATE324485T1 (en) 2006-05-15
DE60210867D1 (en) 2006-06-01
BR0202504A (en) 2003-04-01
DE60210867T2 (en) 2007-05-10
EP1270805B1 (en) 2006-04-26
EP1270805A2 (en) 2003-01-02
JP2004522008A (en) 2004-07-22
WO2002099186A1 (en) 2002-12-12

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