DE68912322D1 - Process for bleaching sulfate pulp. - Google Patents

Process for bleaching sulfate pulp.

Info

Publication number
DE68912322D1
DE68912322D1 DE89117234T DE68912322T DE68912322D1 DE 68912322 D1 DE68912322 D1 DE 68912322D1 DE 89117234 T DE89117234 T DE 89117234T DE 68912322 T DE68912322 T DE 68912322T DE 68912322 D1 DE68912322 D1 DE 68912322D1
Authority
DE
Germany
Prior art keywords
chlorine
bleaching
procedure
pulp
oxidating
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
DE89117234T
Other languages
German (de)
Inventor
Marja Vaheri
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=8528744&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE68912322(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 DE68912322D1 publication Critical patent/DE68912322D1/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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Paper (AREA)
  • Noodles (AREA)
  • Cereal-Derived Products (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Table Devices Or Equipment (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Hard Magnetic Materials (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

The invention concerns a procedure for the bleaching of pulp, in which procedure an oxidating bleaching chemical containing chlorine is used. The essential feature of the invention is that the pulp is treated, either in conjunction with or before oxidation, with a lignin-modifying oxidation-reduction enzyme, such as the lactase produced by the white-rot fungus. The oxidating bleaching chemical used in the procedure may be chlorine dioxide or a mixture of chlorine dioxide and chlorine gas. The use of said enzyme reduces the amount of chlorophenols and other forms of organically bound chlorine in the spent bleach liquor, simultaneously lowering its chemical oxygen demand.
DE89117234T 1989-07-10 1989-09-18 Process for bleaching sulfate pulp. Expired - Lifetime DE68912322D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI893338A FI88316C (en) 1989-07-10 1989-07-10 Process for bleaching cellulose pulp

Publications (1)

Publication Number Publication Date
DE68912322D1 true DE68912322D1 (en) 1994-02-24

Family

ID=8528744

Family Applications (1)

Application Number Title Priority Date Filing Date
DE89117234T Expired - Lifetime DE68912322D1 (en) 1989-07-10 1989-09-18 Process for bleaching sulfate pulp.

Country Status (8)

Country Link
EP (1) EP0408803B1 (en)
JP (1) JP2831048B2 (en)
AT (1) ATE100157T1 (en)
CA (1) CA1335184C (en)
DE (1) DE68912322D1 (en)
ES (1) ES2061857T3 (en)
FI (1) FI88316C (en)
NO (1) NO175105C (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
CA2115881C (en) * 1993-02-25 2000-05-23 Michael G. Paice Non-chlorine bleaching of kraft pulp
US5480801A (en) * 1993-09-17 1996-01-02 Novo Nordisk A/S Purified PH neutral Rhizoctonia laccases and nucleic acids encoding same
US6942754B2 (en) 1999-03-23 2005-09-13 Oji Paper Co., Ltd. Process for producing xylooligosaccharide from lignocellulose pulp
US6824646B2 (en) 1999-03-23 2004-11-30 Oji Paper Co., Ltd. Process for oxygen bleaching and enzyme treating lignocellulosic pulp with liquid treatment and recovery
FI113879B (en) 2000-05-23 2004-06-30 Valtion Teknillinen A new coating enzyme
ES2221529B1 (en) * 2002-07-10 2005-11-01 Instituto Nacional De Investigacion Y Tecnologia Agraria Y Alimentaria (Inia) PROCEDURE FOR THE DESLIGNIFICATION OF CELLULOSE PASTA.
CN109537343A (en) * 2018-11-29 2019-03-29 崔雪柯 A kind of paper pulp gas-water separation technique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3636208A1 (en) * 1986-10-24 1988-05-05 Call Hans Peter METHOD FOR DELIGNIFYING AND WHICH BLEACHING LIGNICELLULOSE-CONTAINING OR LIGNINAL MATERIAL OR LIGNIN BY ENZYMATIC TREATMENT

Also Published As

Publication number Publication date
FI88316B (en) 1993-01-15
FI893338A (en) 1991-01-11
EP0408803A1 (en) 1991-01-23
JP2831048B2 (en) 1998-12-02
EP0408803B1 (en) 1994-01-12
ES2061857T3 (en) 1994-12-16
ATE100157T1 (en) 1994-01-15
NO175105B (en) 1994-05-24
FI88316C (en) 1993-04-26
FI893338A0 (en) 1989-07-10
JPH03130485A (en) 1991-06-04
NO175105C (en) 1994-08-31
NO893715L (en) 1991-01-11
NO893715D0 (en) 1989-09-18
CA1335184C (en) 1995-04-11

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ATE103351T1 (en) METHOD OF BLEACHING PULP.
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DE68912322D1 (en) Process for bleaching sulfate pulp.
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Legal Events

Date Code Title Description
8330 Complete renunciation