DE68914135D1 - Process for bleaching pulp. - Google Patents

Process for bleaching pulp.

Info

Publication number
DE68914135D1
DE68914135D1 DE89117235T DE68914135T DE68914135D1 DE 68914135 D1 DE68914135 D1 DE 68914135D1 DE 89117235 T DE89117235 T DE 89117235T DE 68914135 T DE68914135 T DE 68914135T DE 68914135 D1 DE68914135 D1 DE 68914135D1
Authority
DE
Germany
Prior art keywords
pulp
oxidation
bleaching
chemical
chlorine
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
DE89117235T
Other languages
German (de)
Inventor
Marja Vaheri
Veikko Jokela
Kari Miikki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stora Enso Oyj
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8527891&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE68914135(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Enso Gutzeit Oy filed Critical Enso Gutzeit Oy
Application granted granted Critical
Publication of DE68914135D1 publication Critical patent/DE68914135D1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Noodles (AREA)
  • Cereal-Derived Products (AREA)
  • Table Devices Or Equipment (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

The invention concerns a procedure for the bleaching of pulp using an oxidating bleaching chemical containing chlorine. The essential features of the invention are that the chemical used in the oxidation stage has a chlorine dioxide content of at least 50 %, that the pulp is subjected to enzyme treatment either in conjunction with or before the oxidation, and that, after the oxidation and enzyme treatment, the pulp is treated with an alkali. The use of enzymes reduces the amount of chlorophenols and other forms of organically bound chlorine in the spent bleach liquor, simultaneously lowering its chemical oxygen demand.
DE89117235T 1989-02-14 1989-09-18 Process for bleaching pulp. Expired - Lifetime DE68914135D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI890700A FI90888B (en) 1989-02-14 1989-02-14 Method for bleaching cellulose pulp

Publications (1)

Publication Number Publication Date
DE68914135D1 true DE68914135D1 (en) 1994-04-28

Family

ID=8527891

Family Applications (1)

Application Number Title Priority Date Filing Date
DE89117235T Expired - Lifetime DE68914135D1 (en) 1989-02-14 1989-09-18 Process for bleaching pulp.

Country Status (8)

Country Link
EP (1) EP0383999B1 (en)
JP (1) JPH02221482A (en)
AT (1) ATE103351T1 (en)
CA (1) CA1339594C (en)
DE (1) DE68914135D1 (en)
ES (1) ES2050747T3 (en)
FI (1) FI90888B (en)
NO (1) NO176406C (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI86896B (en) * 1989-05-04 1992-07-15 Enso Gutzeit Oy FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA.
SE465320B (en) * 1990-01-10 1991-08-26 Korsnaes Ab PREPARATIONS SUBMITTING ENZYMATIC DELIGNIFICATION ACTIVITY, MADE TO MAKE THE SAME AND APPLICATIONS THEREOF
FI89814C (en) * 1990-02-02 1993-11-25 Enso Gutzeit Oy FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA
US5837515A (en) * 1990-05-16 1998-11-17 Alko-Yhtiot Oy Enzyme preparations and methods for their production
JP2859393B2 (en) * 1990-07-24 1999-02-17 ノボ ノルディスク アクティーゼルスカブ Cellulase and method for producing the same
DK203490D0 (en) * 1990-08-24 1990-08-24 Novo Nordisk As PROCEDURE FOR TREATING LIGNOCELLULOS PULP AND APPARATUS FOR PERFORMING THE PROCESS
DE4129739A1 (en) * 1990-09-11 1992-03-12 Sandoz Ag Chlorine-free bleaching of paper pulp
FI108800B (en) * 1991-05-07 2002-03-28 Iogen Corp A method and apparatus for using an enzyme in the manufacture and bleaching of pulp
CA2044100A1 (en) * 1991-06-07 1992-12-08 Janice Hamilton Biobleaching process
US5369024A (en) * 1992-03-25 1994-11-29 The United States Of America As Represented By The Secretary Of Agriculture Xylanase from streptomyces roseiscleroticus NRRL-11019 for removing color from kraft wood pulps
US5498534A (en) * 1992-03-25 1996-03-12 The United States Of America As Represented By The Secretary Of Agriculture Method of removing color from wood pulp using xylanase from streptomyces roseiscleroticus NRRL B-11019
DE4422307A1 (en) * 1994-06-17 1995-12-21 Melitta Haushaltsprodukte Process for delignifying and bleaching unbleached pulp suspensions using nitrogen compounds
US5871730A (en) * 1994-07-29 1999-02-16 Universite De Sherbrooke Thermostable xylanase DNA, protein and methods of use
US6300114B1 (en) 1994-07-29 2001-10-09 Rohm Enzyme Finland Oy Sequences of xylanase and xylanase expression vectors
US5935836A (en) * 1994-07-29 1999-08-10 Rohm Enzyme Finland Oy Actinomadura xylanase sequences and methods of use
US7816129B2 (en) 1994-07-29 2010-10-19 Ab Enzymes Gmbh Production and secretion of proteins of bacterial origin in filamentous fungi
US7320741B2 (en) 2001-01-18 2008-01-22 Iogen Bio-Products Corporation Method of xylanase treatment in a chlorine dioxide bleaching sequence
CA2477847A1 (en) 2002-03-06 2003-09-12 Iogen Bio-Products Corporation Xylanase treatment of chemical pulp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1086905A (en) * 1977-10-25 1980-10-07 W. Howard Rapson Bleach plant operation
JPS5468402A (en) * 1977-11-09 1979-06-01 Kogyo Gijutsuin Property modification of biochemical pulp
FI81395B (en) * 1988-03-14 1990-06-29 Cultor Oy FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA.

Also Published As

Publication number Publication date
EP0383999B1 (en) 1994-03-23
NO893714D0 (en) 1989-09-18
NO893714L (en) 1990-08-15
FI890700A (en) 1990-08-15
JPH02221482A (en) 1990-09-04
CA1339594C (en) 1997-12-23
FI890700A0 (en) 1989-02-14
FI90888B (en) 1993-12-31
NO176406B (en) 1994-12-19
ATE103351T1 (en) 1994-04-15
NO176406C (en) 1995-03-29
ES2050747T3 (en) 1994-06-01
EP0383999A3 (en) 1990-12-12
EP0383999A2 (en) 1990-08-29

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Legal Events

Date Code Title Description
8332 No legal effect for de