SE9500927L - Method for tcf or efc bleaching of pulp - Google Patents

Method for tcf or efc bleaching of pulp

Info

Publication number
SE9500927L
SE9500927L SE9500927A SE9500927A SE9500927L SE 9500927 L SE9500927 L SE 9500927L SE 9500927 A SE9500927 A SE 9500927A SE 9500927 A SE9500927 A SE 9500927A SE 9500927 L SE9500927 L SE 9500927L
Authority
SE
Sweden
Prior art keywords
pulp
stage
bleaching
tcf
subjected
Prior art date
Application number
SE9500927A
Other languages
Swedish (sv)
Other versions
SE9500927D0 (en
SE9500927A0 (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
Priority claimed from FI941229A external-priority patent/FI98839B/en
Priority claimed from FI944348A external-priority patent/FI944348A/en
Application filed by Ahlstroem Oy filed Critical Ahlstroem Oy
Publication of SE9500927D0 publication Critical patent/SE9500927D0/en
Publication of SE9500927L publication Critical patent/SE9500927L/en
Publication of SE9500927A0 publication Critical patent/SE9500927A0/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
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
    • 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

Landscapes

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

Abstract

Cellulose pulp, particularly medium consistency (i.e. 5-25%) sulphate chemical pulp digested to a low Kappa number (25 or less if an oxygen delignification stage is used, or 12 or less if not), is subjected to various TCF bleaching sequences. The pulp is treated in an acid stage at a pH between 2-7 (preferably about 2-5) for a time period (10 seconds to hours) sufficient to insure that the pulp fibers themselves are at the desired pH. Then the pulp is washed (e.g. a fractionating wash) or pressed. The pulp is subjected to a multistage bleaching sequence including at least one peroxide stage after the washing or pressing (e.g. an Op, Po, or Pa, (such as a Pa Q/A) stage). The temperature during each stage of the bleach sequence is between about 80120.degree.C so that energy is conserved and equipment minimized.
SE9500927A 1994-03-16 1995-03-16 Method for tcf or efc bleaching of pulp SE9500927A0 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI941229A FI98839B (en) 1994-03-16 1994-03-16 Method for bleaching of pulp
FI944348A FI944348A (en) 1994-09-19 1994-09-19 Procedure for bleaching of pulp
FI950200A FI950200A (en) 1994-03-16 1995-01-17 Method for bleaching pulp

Publications (3)

Publication Number Publication Date
SE9500927D0 SE9500927D0 (en) 1995-03-16
SE9500927L true SE9500927L (en) 1995-09-17
SE9500927A0 SE9500927A0 (en) 1995-09-17

Family

ID=27241603

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9500927A SE9500927A0 (en) 1994-03-16 1995-03-16 Method for tcf or efc bleaching of pulp

Country Status (3)

Country Link
CA (1) CA2144677A1 (en)
FI (1) FI950200A (en)
SE (1) SE9500927A0 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE538752C2 (en) * 2014-11-21 2016-11-08 Innventia Ab Process for the production of a treated pulp, treated pulp, and textile fibres produced from the treated pulp

Also Published As

Publication number Publication date
CA2144677A1 (en) 1995-09-17
FI950200A (en) 1995-09-17
SE9500927D0 (en) 1995-03-16
SE9500927A0 (en) 1995-09-17
FI950200A0 (en) 1995-01-17

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