SE9604217L - Method and apparatus for delignifying chemical pulp - Google Patents

Method and apparatus for delignifying chemical pulp

Info

Publication number
SE9604217L
SE9604217L SE9604217A SE9604217A SE9604217L SE 9604217 L SE9604217 L SE 9604217L SE 9604217 A SE9604217 A SE 9604217A SE 9604217 A SE9604217 A SE 9604217A SE 9604217 L SE9604217 L SE 9604217L
Authority
SE
Sweden
Prior art keywords
pulp
delignification
alkali
chemical pulp
steps
Prior art date
Application number
SE9604217A
Other languages
Swedish (sv)
Other versions
SE9604217A0 (en
SE9604217D0 (en
Inventor
Risto Loeppoenen
Olavi Pikka
Original Assignee
Ahlstrom Machinery 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 Ahlstrom Machinery Oy filed Critical Ahlstrom Machinery Oy
Publication of SE9604217D0 publication Critical patent/SE9604217D0/en
Publication of SE9604217A0 publication Critical patent/SE9604217A0/en
Publication of SE9604217L publication Critical patent/SE9604217L/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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications

Landscapes

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

Abstract

The present invention relates to a method of delignifying chemical pulp. In particular, the invention relates to delignification of pulp with oxygen under alkaline conditions in such a way that white liquor is preferably used as the source of alkali. Especially preferably, the method according to the invention is applicable to delignification of so called Kraft pulp. It is characteristic of the method according to the invention that the pulp is l ed in the same delignification stage through more than one delignification steps, and that oxygen and alkali are added into the pulp between at least two steps, said alkali being unoxidized white or green liquor.
SE9604217A 1995-11-16 1996-11-18 Method and apparatus for delignifying chemical pulp SE9604217L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI955519A FI955519A (en) 1995-11-16 1995-11-16 Method and apparatus for delignifying chemical pulp

Publications (3)

Publication Number Publication Date
SE9604217D0 SE9604217D0 (en) 1996-11-18
SE9604217A0 SE9604217A0 (en) 1997-05-17
SE9604217L true SE9604217L (en) 1997-05-17

Family

ID=8544398

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9604217A SE9604217L (en) 1995-11-16 1996-11-18 Method and apparatus for delignifying chemical pulp

Country Status (3)

Country Link
CA (1) CA2190573A1 (en)
FI (1) FI955519A (en)
SE (1) SE9604217L (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE540043C2 (en) * 2015-11-27 2018-03-06 Valmet Oy Method and system for oxygen delignification of cellulose pulp

Also Published As

Publication number Publication date
SE9604217A0 (en) 1997-05-17
SE9604217D0 (en) 1996-11-18
CA2190573A1 (en) 1997-05-17
FI955519A (en) 1997-05-17
FI955519A0 (en) 1995-11-16

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