SE9500573D0 - Bleaching pulp with peroxide at superatmospheric pressure and in multiple stages - Google Patents

Bleaching pulp with peroxide at superatmospheric pressure and in multiple stages

Info

Publication number
SE9500573D0
SE9500573D0 SE9500573A SE9500573A SE9500573D0 SE 9500573 D0 SE9500573 D0 SE 9500573D0 SE 9500573 A SE9500573 A SE 9500573A SE 9500573 A SE9500573 A SE 9500573A SE 9500573 D0 SE9500573 D0 SE 9500573D0
Authority
SE
Sweden
Prior art keywords
peroxide
pulp
superatmospheric pressure
mixt
multiple stages
Prior art date
Application number
SE9500573A
Other languages
Swedish (sv)
Other versions
SE516065C2 (en
SE9500573L (en
Inventor
Kaj Henricson
Brian Greenwood
Bjoern Svedin
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
Application filed by Ahlstroem Oy filed Critical Ahlstroem Oy
Priority to SE9500573A priority Critical patent/SE516065C2/en
Publication of SE9500573D0 publication Critical patent/SE9500573D0/en
Publication of SE9500573L publication Critical patent/SE9500573L/en
Publication of SE516065C2 publication Critical patent/SE516065C2/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
    • D21C9/16—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

In the process for bleaching cellulosic pulp with peroxide, using at least one pressurised bleaching vessel: (a) peroxide is blended with the pulp to form an intimate mixt.; (b) the mixt. is added to the pressurised bleaching vessel where the pulp is bleached in a superatmospheric pressure to form oxygen and reaction gases; (c) at least 20 % of the oxygen and reaction gases are removed from the mixt. before all the peroxide is used up; (d) the mixt. is added to a second vessel where the temp. is greater, pressure is lower and treatment time is longer than in the first vessel; and (e) the remaining oxygen and reaction gases are removed from the pulp.
SE9500573A 1995-02-16 1995-02-16 Peroxide bleaching process for pref. chemical pulp SE516065C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9500573A SE516065C2 (en) 1995-02-16 1995-02-16 Peroxide bleaching process for pref. chemical pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9500573A SE516065C2 (en) 1995-02-16 1995-02-16 Peroxide bleaching process for pref. chemical pulp

Publications (3)

Publication Number Publication Date
SE9500573D0 true SE9500573D0 (en) 1995-02-16
SE9500573L SE9500573L (en) 1996-08-17
SE516065C2 SE516065C2 (en) 2001-11-12

Family

ID=20397250

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9500573A SE516065C2 (en) 1995-02-16 1995-02-16 Peroxide bleaching process for pref. chemical pulp

Country Status (1)

Country Link
SE (1) SE516065C2 (en)

Also Published As

Publication number Publication date
SE516065C2 (en) 2001-11-12
SE9500573L (en) 1996-08-17

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Legal Events

Date Code Title Description
NUG Patent has lapsed