NO961139L - Chlorine-free chemical pulp bleaching by two-stage bleaching with chelating agent - Google Patents

Chlorine-free chemical pulp bleaching by two-stage bleaching with chelating agent

Info

Publication number
NO961139L
NO961139L NO961139A NO961139A NO961139L NO 961139 L NO961139 L NO 961139L NO 961139 A NO961139 A NO 961139A NO 961139 A NO961139 A NO 961139A NO 961139 L NO961139 L NO 961139L
Authority
NO
Norway
Prior art keywords
bleaching
chelating agent
chlorine
pulp
chemical pulp
Prior art date
Application number
NO961139A
Other languages
Norwegian (no)
Other versions
NO961139D0 (en
Inventor
Maarten Dahl
Solveig Norden
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
Publication of NO961139D0 publication Critical patent/NO961139D0/en
Publication of NO961139L publication Critical 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

En fremgangsmåte for bleking av lignocelluloseholdig fibermateriale i form av kjemisk masse uten bruk av klor-blekemidler, hvor massen behandles med chelatdanner og blekes med ozon og peroksyd. Umiddelbart etter ozon-blekingen blir massen behandlet med chelatdanner i et andre chelateringstrinn ved en massekonsentrasjon pål-10%il-30 minutter ved en temperatur på 20 - 90°C og pH-verdi 1,5 - 5. Den således behandlete masse vaskes og awannes til en konsentrasjon på 8 - 40 % forut for peroksyd-blekingen.A process for bleaching lignocellulosic fibrous material in the form of chemical pulp without the use of chlorine bleaches, wherein the pulp is treated with chelating agent and 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 10-10% for 30 minutes at a temperature of 20 - 90 ° C and a pH of 1.5-5. The pulp thus treated is washed and is concentrated to a concentration of 8 - 40% prior to the peroxide bleaching.

NO961139A 1993-09-21 1996-03-20 Chlorine-free chemical pulp bleaching by two-stage bleaching with chelating agent NO961139L (en)

Applications Claiming Priority (2)

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
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 (2)

Publication Number Publication Date
NO961139D0 NO961139D0 (en) 1996-03-20
NO961139L true NO961139L (en) 1996-03-20

Family

ID=20391160

Family Applications (1)

Application Number Title Priority Date Filing Date
NO961139A NO961139L (en) 1993-09-21 1996-03-20 Chlorine-free chemical pulp bleaching by two-stage bleaching 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) 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
CA2099881A1 (en) * 1991-01-03 1992-07-04 Omar F. Ali 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
JPH09503028A (en) 1997-03-25
AU7792394A (en) 1995-04-10
NO961139D0 (en) 1996-03-20
FI961279A0 (en) 1996-03-20
EP0720675A1 (en) 1996-07-10
CA2168445A1 (en) 1995-03-30
SE501836C2 (en) 1995-05-22
BR9407555A (en) 1996-12-31
WO1995008666A1 (en) 1995-03-30
FI961279A (en) 1996-03-20
SE9303066L (en) 1995-03-22
SE9303066D0 (en) 1993-09-21

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