CA1339593C - Procedure for the bleaching of pulp in which oxygen is used as the oxidating bleaching chemical - Google Patents

Procedure for the bleaching of pulp in which oxygen is used as the oxidating bleaching chemical

Info

Publication number
CA1339593C
CA1339593C CA000611771A CA611771A CA1339593C CA 1339593 C CA1339593 C CA 1339593C CA 000611771 A CA000611771 A CA 000611771A CA 611771 A CA611771 A CA 611771A CA 1339593 C CA1339593 C CA 1339593C
Authority
CA
Canada
Prior art keywords
bleaching
pulp
oxygen
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 - Fee Related
Application number
CA000611771A
Other languages
French (fr)
Inventor
Marja Vaheri
Kari Miikki
Veikko Jokela
Kimmo Ruohoniemi
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.)
Enzo Gutzeit Oy
Original Assignee
Enzo 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=8528357&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA1339593(C) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Enzo Gutzeit Oy filed Critical Enzo Gutzeit Oy
Application granted granted Critical
Publication of CA1339593C publication Critical patent/CA1339593C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
    • 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
    • D21C9/1057—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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Paper (AREA)
  • Noodles (AREA)
  • Cereal-Derived Products (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Hard Magnetic Materials (AREA)
  • Bakery Products And Manufacturing Methods Therefor (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Table Devices Or Equipment (AREA)
  • Detergent Compositions (AREA)

Abstract

The invention concerns a procedure for the bleaching of pulp using oxygen as an oxidating bleaching chemical. The essential features of the invention are that oxygen is used in the first oxidation stage of the bleaching process, that the pulp is subjected to enzyme treatment, and that after oxygen bleaching and enzyme treatment, the pulp is washed.
According to the invention, the subsequent oxidation stages can be implemented using bleaching chemicals containing chlorine, e.g. chlorine gas and/or chlorine dioxide. The use of enzymes allows partial burning of the washings and enables the amounts of toxic compounds in the bleaching effluent to be reduced, simultaneously lowering its chemical oxygen demand.

Claims (15)

1. A process for bleaching pulp, comprising using oxygen as the bleaching chemical in a first oxidation stage of the process, treating the pulp with an enzyme, and after the oxygen bleaching and enzyme treatment washing the pulp, wherein the content of organic compounds in the resultant bleaching effluent is reduced by more than 70%.
2. The process of claim 1, wherein the enzyme treatment is effected before the first oxidation stage.
3. The process of claim 1, wherein the enzyme treatment is effected after the first oxidation stage.
4. The process of claim 1, 2 or 3, wherein subsequent oxidation stages of the process are effected using a bleaching chemical containing chlorine.
5. The process of claim 4, wherein the bleaching chemical is chlorine gas, chlorine dioxide or a mixture thereof.
6. The process of claim 4, wherein between each subsequent oxidation stage the pulp is treated with an alkali.
7. The process of claim 6, wherein the alkali is sodium hydroxide.
8. The process of claim 1, 2, 3, 5, 6 or 7, wherein the enzyme is selected from the group consisting of hemicellulase, cellulase, pectinase, esterase and a mixture thereof.
9. The process of claim 1, 2, 3, 5, 6 or 7, wherein the enzyme treatment is at a temperature of 10 to 90°C and a pH
of 3.0 to 10Ø
10. The process of claim 9, wherein the temperature is 40 to 80°C and the pH is 4.0 to 8Ø
11. The process of claim 1, 2, 3, 5, 6, 7 or 10, applied to a softwood pulp.
12. Use of an enzyme in the bleaching of pulp, wherein oxygen is used as the bleaching chemical in a first oxidation stage, wherein the content of organic compounds in the resultant bleaching effluent is reduced by more than 70%.
13. The use of claim 12, wherein subsequent oxidation stages a bleaching agent containing chlorine is used.
14. The use of claim 13, wherein the chlorine containing chemical is chlorine gas, chlorine dioxide or a mixture thereof.
15. The use of claim 12, 13 or 14, wherein the enzyme is selected from the group consisting of hemicellulase, cellulase, pectinase, esterase and a mixture thereof.
CA000611771A 1989-05-04 1989-09-18 Procedure for the bleaching of pulp in which oxygen is used as the oxidating bleaching chemical Expired - Fee Related CA1339593C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI892151A FI86896B (en) 1989-05-04 1989-05-04 FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA.
FI892151 1989-05-04

Publications (1)

Publication Number Publication Date
CA1339593C true CA1339593C (en) 1997-12-23

Family

ID=8528357

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000611771A Expired - Fee Related CA1339593C (en) 1989-05-04 1989-09-18 Procedure for the bleaching of pulp in which oxygen is used as the oxidating bleaching chemical

Country Status (8)

Country Link
EP (1) EP0395792B1 (en)
JP (1) JPH02293486A (en)
AT (1) ATE91518T1 (en)
CA (1) CA1339593C (en)
DE (1) DE68907593D1 (en)
ES (1) ES2045320T3 (en)
FI (1) FI86896B (en)
NO (1) NO172355C (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT94984A (en) * 1989-08-14 1991-04-18 Cultor Oy APPROPRIATE PROCESS FOR WHOLE PULP TO OXYGEN
SE465320B (en) * 1990-01-10 1991-08-26 Korsnaes Ab PREPARATIONS SUBMITTING ENZYMATIC DELIGNIFICATION ACTIVITY, MADE TO MAKE THE SAME AND APPLICATIONS THEREOF
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
DE4129739A1 (en) * 1990-09-11 1992-03-12 Sandoz Ag Chlorine-free bleaching of paper pulp
JPH04240287A (en) * 1991-01-21 1992-08-27 Kobe Steel Ltd Bleaching of pulp
FI90670C (en) * 1991-05-02 1994-03-10 Metsae Serla Oy Treatment of alkali-treated pulp for use in papermaking
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
US5785811A (en) * 1992-11-09 1998-07-28 The Mead Corporation Process for treating lignocellulosic material with soybean peroxidase in the presence of peroxide
US5935836A (en) * 1994-07-29 1999-08-10 Rohm Enzyme Finland Oy Actinomadura xylanase sequences and methods of use
US6300114B1 (en) 1994-07-29 2001-10-09 Rohm Enzyme Finland Oy Sequences of xylanase and xylanase expression vectors
US5871730A (en) * 1994-07-29 1999-02-16 Universite De Sherbrooke Thermostable xylanase DNA, protein 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
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
CA2301371C (en) * 1999-03-23 2009-09-01 Oji Paper Co., Ltd. Process for bleaching lignocellulose pulp
US6942754B2 (en) 1999-03-23 2005-09-13 Oji Paper Co., Ltd. Process for producing xylooligosaccharide from lignocellulose pulp
AU2002226210A1 (en) 2000-12-22 2002-07-08 Iogen Bio-Products Corporation Alkaline extraction stages comprising xylanase
US9096519B2 (en) 2013-01-10 2015-08-04 California Institute Of Technology Process for the synthesis of ketones from internal alkenes
US9586883B2 (en) 2013-04-19 2017-03-07 California Institute Of Technology Aldehyde-selective wacker-type oxidation of unbiased alkenes
CN111979823A (en) * 2020-08-07 2020-11-24 齐鲁工业大学 Sulfate wood pulp short-process ECF bleaching process X/D-Z-P (X/Z-D-P)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.
FI90888B (en) * 1989-02-14 1993-12-31 Enso Gutzeit Oy Method for bleaching cellulose pulp

Also Published As

Publication number Publication date
EP0395792B1 (en) 1993-07-14
JPH02293486A (en) 1990-12-04
FI892151A0 (en) 1989-05-04
ES2045320T3 (en) 1994-01-16
EP0395792A3 (en) 1991-01-16
ATE91518T1 (en) 1993-07-15
FI86896B (en) 1992-07-15
NO893716D0 (en) 1989-09-18
NO893716L (en) 1990-11-05
EP0395792A2 (en) 1990-11-07
NO172355C (en) 1993-07-07
FI892151A (en) 1990-11-05
DE68907593D1 (en) 1993-08-19
NO172355B (en) 1993-03-29

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