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AU7792394A - Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent - Google Patents

Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent

Info

Publication number
AU7792394A
AU7792394A AU77923/94A AU7792394A AU7792394A AU 7792394 A AU7792394 A AU 7792394A AU 77923/94 A AU77923/94 A AU 77923/94A AU 7792394 A AU7792394 A AU 7792394A AU 7792394 A AU7792394 A AU 7792394A
Authority
AU
Australia
Prior art keywords
chlorine
chelating agent
chemical pulp
stage treatment
free 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.)
Abandoned
Application number
AU77923/94A
Inventor
Marten Dahl
Solveig Norden
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.)
Valmet AB
Original Assignee
Sunds Defibrator Industries 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
Application filed by Sunds Defibrator Industries AB filed Critical Sunds Defibrator Industries AB
Publication of AU7792394A publication Critical patent/AU7792394A/en
Abandoned 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
    • D21C9/1042—Use of chelating agents
    • 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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
    • 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
AU77923/94A 1993-09-21 1994-08-22 Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent Abandoned AU7792394A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9303066A SE501836C2 (en) 1993-09-21 1993-09-21 Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step
SE9303066 1993-09-21
PCT/SE1994/000758 WO1995008666A1 (en) 1993-09-21 1994-08-22 Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent

Publications (1)

Publication Number Publication Date
AU7792394A true AU7792394A (en) 1995-04-10

Family

ID=20391160

Family Applications (1)

Application Number Title Priority Date Filing Date
AU77923/94A Abandoned AU7792394A (en) 1993-09-21 1994-08-22 Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent

Country Status (9)

Country Link
EP (1) EP0720675A1 (en)
JP (1) JPH09503028A (en)
AU (1) AU7792394A (en)
BR (1) BR9407555A (en)
CA (1) CA2168445A1 (en)
FI (1) FI961279L (en)
NO (1) NO961139L (en)
SE (1) SE501836C2 (en)
WO (1) WO1995008666A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504803C2 (en) * 1995-08-24 1997-04-28 Sunds Defibrator Ind Ab Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing
SE508239C2 (en) * 1997-01-03 1998-09-21 Sunds Defibrator Ind Ab Treatment of pulp with complexing agents in at least one mixing step, without the use of the bleaching tower
CN102587186B (en) * 2012-03-20 2015-03-11 昆明理工大学 Method for bleaching dendrocalamus giganteus chemical pulp
RU2634586C1 (en) * 2016-08-01 2017-10-31 федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" Method of bleaching hardwood sulphate cellulose

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0565625A1 (en) * 1991-01-03 1993-10-20 Union Camp Patent Holding, Inc. Chlorine-free process for bleaching lignocellulosic pulp
SE468355B (en) * 1991-04-30 1992-12-21 Eka Nobel Ab CHEMISTRY OF CHEMICAL MASS THROUGH TREATMENT WITH COMPLEX PICTURES AND OZONE

Also Published As

Publication number Publication date
FI961279A0 (en) 1996-03-20
WO1995008666A1 (en) 1995-03-30
BR9407555A (en) 1996-12-31
SE9303066L (en) 1995-03-22
FI961279L (en) 1996-03-20
CA2168445A1 (en) 1995-03-30
SE9303066D0 (en) 1993-09-21
NO961139D0 (en) 1996-03-20
SE501836C2 (en) 1995-05-22
JPH09503028A (en) 1997-03-25
EP0720675A1 (en) 1996-07-10
NO961139L (en) 1996-03-20

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