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SE9403174L - Method for enzymatic treatment of chemical pulp before bleaching - Google Patents

Method for enzymatic treatment of chemical pulp before bleaching

Info

Publication number
SE9403174L
SE9403174L SE9403174A SE9403174A SE9403174L SE 9403174 L SE9403174 L SE 9403174L SE 9403174 A SE9403174 A SE 9403174A SE 9403174 A SE9403174 A SE 9403174A SE 9403174 L SE9403174 L SE 9403174L
Authority
SE
Sweden
Prior art keywords
pulp
chemical pulp
enzymatic treatment
pulp before
before bleaching
Prior art date
Application number
SE9403174A
Other languages
Swedish (sv)
Other versions
SE9403174D0 (en
Inventor
Haruhiko Kawabata
Shunji Ohmori
Mitsuhiro Matsuhashi
Akira Matsuura
Toshihide Sakai
Koichi Umeda
Original Assignee
Mitsubishi Paper Mills Ltd
Amano Pharma Co Ltd
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 JP009477U external-priority patent/JPH0670208U/en
Application filed by Mitsubishi Paper Mills Ltd, Amano Pharma Co Ltd filed Critical Mitsubishi Paper Mills Ltd
Publication of SE9403174D0 publication Critical patent/SE9403174D0/en
Publication of SE9403174L publication Critical patent/SE9403174L/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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
    • 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
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

This invention provides a method of increasing the degree of delignification of chemical pulp without decreasing the viscosity thereof. In this method, unbleached pulp or pulp which has been subjected to oxygen delignification is subjected to a pre-bleaching treatment, in which xylanase having an activity in the range of pH of not more than 4.5 is used, as the pulp is maintained under acidic conditions. This method enables the quantity of use of a medicine of a chlorine compound to be reduced while maintaining such a degree of whiteness of bleached pulp that permits commercial use, whereby the occurrence of an organic chlorine compound which is environmentally harmful can be minimized.
SE9403174A 1993-01-22 1994-09-21 Method for enzymatic treatment of chemical pulp before bleaching SE9403174L (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP009477U JPH0670208U (en) 1993-01-22 1993-01-22 coil
JP21296693 1993-08-27
PCT/JP1994/000076 WO1994017237A1 (en) 1993-01-22 1994-01-21 Pre-bleaching treatment method using enzyme for chemical pulp

Publications (2)

Publication Number Publication Date
SE9403174D0 SE9403174D0 (en) 1994-09-21
SE9403174L true SE9403174L (en) 1994-11-16

Family

ID=26344222

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9403174A SE9403174L (en) 1993-01-22 1994-09-21 Method for enzymatic treatment of chemical pulp before bleaching

Country Status (4)

Country Link
CA (1) CA2130906A1 (en)
FI (1) FI944350A (en)
SE (1) SE9403174L (en)
WO (1) WO1994017237A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4920504B1 (en) * 1969-06-07 1974-05-25
FR2604198B1 (en) * 1986-09-22 1989-07-07 Du Pin Cellulose PROCESS FOR TREATING A PAPER PULP WITH AN ENZYMATIC SOLUTION.
EP0373108A3 (en) * 1988-11-23 1992-03-04 Sandoz Ag Process for bleaching pulp
US5179021A (en) * 1989-02-10 1993-01-12 Gil Inc. (Now Ici Canada Inc.) Pulp bleaching process comprising oxygen delignification and xylanase enzyme treatment

Also Published As

Publication number Publication date
SE9403174D0 (en) 1994-09-21
WO1994017237A1 (en) 1994-08-04
CA2130906A1 (en) 1994-08-04
FI944350A0 (en) 1994-09-20
FI944350A (en) 1994-09-20

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