SE9303066L - Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step - Google Patents

Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step

Info

Publication number
SE9303066L
SE9303066L SE9303066A SE9303066A SE9303066L SE 9303066 L SE9303066 L SE 9303066L SE 9303066 A SE9303066 A SE 9303066A SE 9303066 A SE9303066 A SE 9303066A SE 9303066 L SE9303066 L SE 9303066L
Authority
SE
Sweden
Prior art keywords
pulp
bleaching
treated
complexing agents
ozone
Prior art date
Application number
SE9303066A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9303066D0 (en
SE501836C2 (en
Inventor
Solveig Norden
Maarten Dahl
Original Assignee
Sunds Defibrator Ind 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 Ind Ab filed Critical Sunds Defibrator Ind Ab
Priority to SE9303066A priority Critical patent/SE501836C2/en
Publication of SE9303066D0 publication Critical patent/SE9303066D0/en
Priority to EP94928521A priority patent/EP0720675A1/en
Priority to JP7509711A priority patent/JPH09503028A/en
Priority to PCT/SE1994/000758 priority patent/WO1995008666A1/en
Priority to AU77923/94A priority patent/AU7792394A/en
Priority to CA002168445A priority patent/CA2168445A1/en
Priority to BR9407555A priority patent/BR9407555A/en
Publication of SE9303066L publication Critical patent/SE9303066L/en
Publication of SE501836C2 publication Critical patent/SE501836C2/en
Priority to FI961279A priority patent/FI961279A/en
Priority to NO961139A priority patent/NO961139L/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
    • D21C9/1026—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)

Abstract

A method for bleaching lignocellulose-containing fiber material in the form of chemical pulp without using chloric bleaching agents where the pulp is treated with chelating agent and is bleached with ozone and peroxide. Immediately after the ozone bleaching the pulp is treated with chelating agent in a second chelating step at a pulp concentration of 1-10 % for 1-30 minutes at the temperature of 20-90 DEG C and the pH value 1,5-5. The pulp thus treated is washed and dewatered to a concentration of 8-40 % prior to the peroxide bleaching.
SE9303066A 1993-09-21 1993-09-21 Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step SE501836C2 (en)

Priority Applications (9)

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
BR9407555A BR9407555A (en) 1993-09-21 1994-08-22 Process for bleaching fiber material containing lignocellulose in the form of chemical pulp without using chlorine bleaching agents
AU77923/94A AU7792394A (en) 1993-09-21 1994-08-22 Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent
JP7509711A JPH09503028A (en) 1993-09-21 1994-08-22 Chlorine-free bleaching of chemical pulp including two-step treatment with chelating agents
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
EP94928521A EP0720675A1 (en) 1993-09-21 1994-08-22 Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent
CA002168445A CA2168445A1 (en) 1993-09-21 1994-08-22 Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent
FI961279A FI961279A (en) 1993-09-21 1996-03-20 Chlorine-free chemical pulp bleaching comprising a two-stage treatment with chelating agent
NO961139A NO961139L (en) 1993-09-21 1996-03-20 Chlorine-free chemical pulp bleaching by two-stage bleaching with chelating agent

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
SE9303066D0 SE9303066D0 (en) 1993-09-21
SE9303066L true SE9303066L (en) 1995-03-22
SE501836C2 SE501836C2 (en) 1995-05-22

Family

ID=20391160

Family Applications (1)

Application Number Title Priority Date Filing Date
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

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) FI961279A (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
BR9205490A (en) * 1991-01-03 1994-04-05 Union Camp Patent Holding Processes for the manufacture of bleached pulp having a final GE britho of at least about 75 and for the delignification and bleaching of a 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
SE9303066D0 (en) 1993-09-21
AU7792394A (en) 1995-04-10
EP0720675A1 (en) 1996-07-10
BR9407555A (en) 1996-12-31
FI961279A0 (en) 1996-03-20
WO1995008666A1 (en) 1995-03-30
JPH09503028A (en) 1997-03-25
NO961139D0 (en) 1996-03-20
SE501836C2 (en) 1995-05-22
FI961279A (en) 1996-03-20
NO961139L (en) 1996-03-20
CA2168445A1 (en) 1995-03-30

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