[go: up one dir, main page]

FI905456A0 - FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA. - Google Patents

FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA.

Info

Publication number
FI905456A0
FI905456A0 FI905456A FI905456A FI905456A0 FI 905456 A0 FI905456 A0 FI 905456A0 FI 905456 A FI905456 A FI 905456A FI 905456 A FI905456 A FI 905456A FI 905456 A0 FI905456 A0 FI 905456A0
Authority
FI
Finland
Prior art keywords
bleaching
cellulosamassa
foerfarande foer
pulp
blekning
Prior art date
Application number
FI905456A
Other languages
Finnish (fi)
Other versions
FI905456L (en
FI905456A7 (en
Inventor
Ilm.
Original Assignee
Enso Gutzeit 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 Enso Gutzeit Oy filed Critical Enso Gutzeit Oy
Priority to FI905456A priority Critical patent/FI905456A7/en
Publication of FI905456A0 publication Critical patent/FI905456A0/en
Priority to PCT/FI1991/000323 priority patent/WO1992007998A1/en
Publication of FI905456L publication Critical patent/FI905456L/en
Publication of FI905456A7 publication Critical patent/FI905456A7/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
    • 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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • 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)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Paper (AREA)

Abstract

The invention relates to a method for bleaching cellulosic pulp, said invention being characterized in that the bleaching process proceeds stagewise from a pretreatment with oxygen subsequently followed by one or more treatments with hydrogen peroxide and chlorine performed in a desired order, and that the pulp is subjected in said process to an enzyme treatment either before or after one or more of the afore-mentioned treatment stages. The bleaching method according to the invention achieves reduction of toxic organic compounds in the waste waters from the bleaching stage, while simultaneously the chemical oxygen demand of the waste water is diminished.
FI905456A 1990-11-02 1990-11-02 Method for bleaching cellulose pulp FI905456A7 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI905456A FI905456A7 (en) 1990-11-02 1990-11-02 Method for bleaching cellulose pulp
PCT/FI1991/000323 WO1992007998A1 (en) 1990-11-02 1991-10-29 Method for bleaching pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI905456A FI905456A7 (en) 1990-11-02 1990-11-02 Method for bleaching cellulose pulp

Publications (3)

Publication Number Publication Date
FI905456A0 true FI905456A0 (en) 1990-11-02
FI905456L FI905456L (en) 1992-05-03
FI905456A7 FI905456A7 (en) 1992-05-03

Family

ID=8531367

Family Applications (1)

Application Number Title Priority Date Filing Date
FI905456A FI905456A7 (en) 1990-11-02 1990-11-02 Method for bleaching cellulose pulp

Country Status (2)

Country Link
FI (1) FI905456A7 (en)
WO (1) WO1992007998A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2115881C (en) * 1993-02-25 2000-05-23 Michael G. Paice Non-chlorine bleaching of kraft pulp
DE4440246C2 (en) * 1994-11-11 1998-06-04 Thueringisches Inst Textil Process for the production of a biodegradable cellulosic fiber composite
AU2002229430A1 (en) 2001-01-18 2002-07-30 Iogen Bio-Products Corporation Use of xylanase in pulp bleaching
CA2436765A1 (en) * 2001-12-03 2003-06-12 Iogen Bio-Products Corporation Bleaching stage using xylanase with hydrogen peroxide, peracids, or a combination thereof
FI20041152L (en) * 2002-03-06 2004-09-06 Iogen Bio Products Corp Xylanase treatment of chemical pulp
DE102004020355A1 (en) * 2004-04-26 2005-11-10 Call, Krimhild Oxidative, reductive, hydrolytic and other enzymatic systems for the oxidation, reduction, coating, coupling and crosslinking of natural and artificial fibers, plastics or other natural and artificial mono- to polymeric materials

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5179021A (en) * 1989-02-10 1993-01-12 Gil Inc. (Now Ici Canada Inc.) Pulp bleaching process comprising oxygen delignification and xylanase enzyme treatment
ZA904441B (en) * 1989-06-22 1991-03-27 Int Paper Co Enzymatic delignification of lignocellulosic material

Also Published As

Publication number Publication date
WO1992007998A1 (en) 1992-05-14
FI905456L (en) 1992-05-03
FI905456A7 (en) 1992-05-03

Similar Documents

Publication Publication Date Title
DE3471087D1 (en) Method of treating peroxide-containing wastewater
DK0489104T3 (en) Method of treating lignocellulosic pulp
FI103899B1 (en) Process for producing extremely pale pulp
CA2211223A1 (en) Method of pretreating pulp to be bleached with peroxide
WO1994023118A3 (en) Bleaching recycled pulp with a reductive-oxidative sequence
FI905456A0 (en) FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA.
SE9102589D0 (en) CHLORINE-FREE PROCESS FOR BLEACHING PULP
SE0302088D0 (en) Method of xylanase in bleaching
ATE125013T1 (en) METHOD FOR PRODUCING HIGH YIELD BLEACHED PULP.
FI900549A0 (en) FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA.
ES2038954A6 (en) Bleaching of paper pulp
FI905954A0 (en) FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA.
BR9306963A (en) Process water treatment method
FI943431A0 (en) Bleaching of chemical pulp
NO302187B1 (en) Method of treating a cellulose pulp
AU6986294A (en) Method of bleaching pulp without using chlorine chemicals
SE9601709D0 (en) Treatment of filtrates in peroxide bleaching or pulp
SE8605510L (en) KEEP WASHING THE PASS
SE9604094D0 (en) Pulp bleaching process
SE9300277D0 (en) CHLORINE-FREE Mass Bleaching
SE9603630D0 (en) Pulp bleaching process
JPH04240287A (en) How to bleach pulp
NO951464L (en) Process for the treatment of sulfite pulp for bleaching with oxygen-containing chemicals
SE9302527D0 (en) SET ON MULTIPLE BLACK
NO984593L (en) Method of Bleaching Chemical Pulp

Legal Events

Date Code Title Description
FD Application lapsed
FD Application lapsed

Owner name: ENZO-GUTZEIT OY