FI950749A - Process for pre-treatment of pulp to be bleached with peroxide - Google Patents

Process for pre-treatment of pulp to be bleached with peroxide Download PDF

Info

Publication number
FI950749A
FI950749A FI950749A FI950749A FI950749A FI 950749 A FI950749 A FI 950749A FI 950749 A FI950749 A FI 950749A FI 950749 A FI950749 A FI 950749A FI 950749 A FI950749 A FI 950749A
Authority
FI
Finland
Prior art keywords
pulp
peroxide
tower
bleached
acid
Prior art date
Application number
FI950749A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI950749A0 (en
FI103817B (en
FI103817B1 (en
Inventor
Kaj Henricson
Olavi Pikka
Original Assignee
Ahlstroem Oy
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=8542888&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=FI950749(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Publication of FI950749A0 publication Critical patent/FI950749A0/en
Priority to FI950749A priority Critical patent/FI103817B1/en
Application filed by Ahlstroem Oy filed Critical Ahlstroem Oy
Priority to SE9502087A priority patent/SE516688E/en
Priority to FI953343A priority patent/FI103819B1/en
Priority to EP96902301A priority patent/EP0858526A1/en
Priority to US08/875,424 priority patent/US6736934B1/en
Priority to PCT/FI1996/000090 priority patent/WO1996025552A1/en
Priority to CA002211223A priority patent/CA2211223C/en
Publication of FI950749A publication Critical patent/FI950749A/en
Publication of FI103817B publication Critical patent/FI103817B/en
Publication of FI103817B1 publication Critical patent/FI103817B1/en
Application granted granted Critical

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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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • 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

Landscapes

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

Abstract

The present invention relates to a process for pretreating pulp, which is to be bleached with peroxide, by treating it with acid and by chelating. In particular, the purpose of the invention is to render more efficient, and at the same time simplify, the pretreatment which the peroxide bleaching requires. The process according to the invention is characterized in that the pulp is fed, at a consistency of 8-20%, into a pressurized acid tower 14 in which the pressure is 0-20 bar, preferably 1-10 bar and the temperature is 60-130 degree C, the pulp is treated in the acid tower 14 for 20-240 minutes, in order to decrease the kappa number and improve the bleachability, at a pH of 2-6, preferably at 3-4, the pulp is conveyed from the acid tower 14 to the chelating tower 24, the pulp is treated with complexing agent for at least 10-60 minutes at a pH of 4-7, preferably at 5-6, and the pulp is washed and/or pressed. <IMAGE>
FI950749A 1995-02-17 1995-02-17 Process for pretreating pulp which is to be bleached with peroxide FI103817B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
FI950749A FI103817B1 (en) 1995-02-17 1995-02-17 Process for pretreating pulp which is to be bleached with peroxide
SE9502087A SE516688E (en) 1995-02-17 1995-06-07 Treatment of pulp before peroxide bleaching with acid and complexing agents
FI953343A FI103819B1 (en) 1995-02-17 1995-07-06 Process for pretreating pulp which is to be bleached with peroxide
EP96902301A EP0858526A1 (en) 1995-02-17 1996-02-16 Method of pretreating pulp to be bleached with peroxide
US08/875,424 US6736934B1 (en) 1995-02-17 1996-02-16 Method of pretreating pulp in an acid tower prior to bleaching with peroxide
PCT/FI1996/000090 WO1996025552A1 (en) 1995-02-17 1996-02-16 Method of pretreating pulp to be bleached with peroxide
CA002211223A CA2211223C (en) 1995-02-17 1996-02-16 Method of pretreating pulp to be bleached with peroxide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI950749 1995-02-17
FI950749A FI103817B1 (en) 1995-02-17 1995-02-17 Process for pretreating pulp which is to be bleached with peroxide

Publications (4)

Publication Number Publication Date
FI950749A0 FI950749A0 (en) 1995-02-17
FI950749A true FI950749A (en) 1996-08-18
FI103817B FI103817B (en) 1999-09-30
FI103817B1 FI103817B1 (en) 1999-09-30

Family

ID=8542888

Family Applications (1)

Application Number Title Priority Date Filing Date
FI950749A FI103817B1 (en) 1995-02-17 1995-02-17 Process for pretreating pulp which is to be bleached with peroxide

Country Status (2)

Country Link
FI (1) FI103817B1 (en)
SE (1) SE516688E (en)

Also Published As

Publication number Publication date
SE9502087D0 (en) 1995-06-07
FI950749A0 (en) 1995-02-17
FI103817B (en) 1999-09-30
FI103817B1 (en) 1999-09-30
SE516688C2 (en) 2002-02-12
SE516688E (en) 2003-12-16
SE9502087L (en) 1996-08-18

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Legal Events

Date Code Title Description
GB Transfer or assigment of application

Owner name: AHLSTROM MACHINERY OY

FCK Appeal rejected

Free format text: APPLICATION REJECTED