EP0408803B1 - Procedure for the bleaching of sulphate pulp - Google Patents

Procedure for the bleaching of sulphate pulp Download PDF

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Publication number
EP0408803B1
EP0408803B1 EP89117234A EP89117234A EP0408803B1 EP 0408803 B1 EP0408803 B1 EP 0408803B1 EP 89117234 A EP89117234 A EP 89117234A EP 89117234 A EP89117234 A EP 89117234A EP 0408803 B1 EP0408803 B1 EP 0408803B1
Authority
EP
European Patent Office
Prior art keywords
pulp
bleaching
procedure
chlorine
enzyme
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
EP89117234A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0408803A1 (en
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8528744&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0408803(B1) "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
Priority to AT89117234T priority Critical patent/ATE100157T1/de
Publication of EP0408803A1 publication Critical patent/EP0408803A1/en
Application granted granted Critical
Publication of EP0408803B1 publication Critical patent/EP0408803B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to a procedure for the bleaching of pulp, in which procedure an oxidating bleaching chemical containing chlorine is used.
  • Especially pulp obtained from a sulphate pulping process is of brown colour, which is mainly due to the lignin remaining in the pulp.
  • Lignin is removed from the pulp by bleaching, which is generally a process consisting of several stages. During this process, the pulp is treated alternately with oxidizing, lignin-degrading chemicals and chemicals dissolving the degradation products. Oxidizing agents commonly used are chlorine-containing chemicals and oxygen, whereas alkali solutions are used for eliminating the degradation products.
  • the spent bleach liquors causing the worst environmental pollution load are produced in the washing stages following the first chlorination and the first alkali treatment in the bleaching process.
  • various methods have been employed, including the use of chlorine dioxide instead of chlorine gas, the use of oxygen as an oxidating chemical in the first bleaching stage, and biological purification of the spent bleach liquor.
  • these methods have not yielded completely satisfactory results.
  • the amounts of chlorophenols and other toxic-chlorine compounds in the spent bleach liquor have been significantly reduced by using chlorine dioxide and employing oxygen bleaching, it has not been possible to achieve a sufficient reduction in the chemical oxygen demand values of the effluents. Therefore, the methods referred to have required the employment of efficient biological purification.
  • DE-A-3 636 208 discloses a method based on the treatment of natural or mechanically modified pulp raw material. The process is described with one example in which straw is treated with enzymes in order to dissolve the lignin. It has to be noted that there are significant differences of the structure of straw lignin and wood lignin (Wei He Diesheng Tai and Stephen Y. Lin, 1991). In addition, the known process calls for a pretreatment, whereby straw was pretreated with 1-2 % NaOH for 24-28 hrs, and was grinded before addition of enzyme. Such pretreatment is technically difficult, and not suitable for removing of the wood lignin.
  • the object of the present invention is to achieve a sulphate pulp bleaching procedure that enables the toxic content and chemical oxygen demand of the spent bleach liquor to be reduced so as to reduce the need for purification of the liquor. This object is achieved by the characterizing part of claim 1.
  • a treatment with a suitable redox enzyme reduces the amount of chlorine chemicals required for bleaching, thereby also reducing the amounts of organic chlorine compounds left in the spent bleach liquor.
  • the redox potential of the enzymatic reaction should be below 400 mV, preferably below 250 mV.
  • Suitable redox enzymes are phenoloxidases, such as the laccase produced by the white-rot fungus.
  • the bleaching of pulp by the procedure of the invention can be performed in the conventional manner by employing alternate oxidation and alkali stages and washing the pulp after each of these stages to remove the bleaching chemicals and degradation products.
  • the enzyme treatment as taught by the invention is preferably carried out in a temperature range of 10-90 °C, the most suitable range being 40-80 °C, with pH values in the range 3.0-10.0, preferably 4.0-8.0.
  • the enzyme used is the lignin-modifying oxidation-reduction enzyme, laccase, as mentioned above.
  • the invention also concerns the use of a lignin-modifying enzyme, e.g. the laccase produced by the white-rot fungus, in the bleaching of sulphate pulp using an oxidating bleaching chemical containing chlorine.
  • a lignin-modifying enzyme e.g. the laccase produced by the white-rot fungus
  • a diluted enzyme mixture of laccase produced by the Trametes hirsuta white-rot fungus was added to 220 g of dry matter obtained from pine sulphate pulp (with a dry matter content of 30%) so that a mixture with a consistency of 10% and a laccase activity of 60 U/kg of pulp dry matter was obtained.
  • the temperature in the enzyme treatment was 55 °C and the duration of treatment 2 h. After the enzyme treatment the pulp wax filtered in a Buchner funnel and the pulp cake obtained was washed with ion-exchange-treated water so that a wash ratio of 20 was obtained.
  • both the pulp quantity which had undergone enzyme treatment and the reference portion were bleached by a process consisting of five successive stages of oxidation and bleaching.
  • the chemicals used were chlorine (90%) and chlorine dioxide (10%), in the second stage sodium hydroxide, in the third stage chlorine dioxide, in the fourth stage sodium hydroxide and in the fifth stage chlorine dioxide.
  • the experiment shows that by using a lignin-modifying enzyme, i.e. laccase, a substantial reduction in the amount of chlorine has been achieved.
  • a lignin-modifying enzyme i.e. laccase

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)
  • Investigating Or Analysing Biological Materials (AREA)
  • Hard Magnetic Materials (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Cereal-Derived Products (AREA)
  • Table Devices Or Equipment (AREA)
EP89117234A 1989-07-10 1989-09-18 Procedure for the bleaching of sulphate pulp Expired - Lifetime EP0408803B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89117234T ATE100157T1 (de) 1989-07-10 1989-09-18 Verfahren zum bleichen von sulfatzellstoff.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI893338A FI88316C (fi) 1989-07-10 1989-07-10 Foerfarande foer blekning av cellulosamassa
FI893338 1989-07-10

Publications (2)

Publication Number Publication Date
EP0408803A1 EP0408803A1 (en) 1991-01-23
EP0408803B1 true EP0408803B1 (en) 1994-01-12

Family

ID=8528744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117234A Expired - Lifetime EP0408803B1 (en) 1989-07-10 1989-09-18 Procedure for the bleaching of sulphate pulp

Country Status (8)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7183090B2 (en) 2000-05-23 2007-02-27 Valtion Teknillinen Tutkimuskeskus Laccase enzyme and the gene encoding the enzyme

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI108800B (fi) * 1991-05-07 2002-03-28 Iogen Corp Menetelmä ja laitteisto entsyymin käyttämiseksi paperimassan valmistuksessa ja valkaisussa
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
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
US6942754B2 (en) 1999-03-23 2005-09-13 Oji Paper Co., Ltd. Process for producing xylooligosaccharide from lignocellulose pulp
ES2221529B1 (es) * 2002-07-10 2005-11-01 Instituto Nacional De Investigacion Y Tecnologia Agraria Y Alimentaria (Inia) Procedimiento para la deslignificacion de pastas de celulosa.
CN109537343A (zh) * 2018-11-29 2019-03-29 崔雪柯 一种纸浆气水分离工艺

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3636208A1 (de) * 1986-10-24 1988-05-05 Call Hans Peter Verfahren zur delignifizierung und bleichung von lignicellulosehaltigem bzw. ligninhaltigem material bzw. lignin durch enzymatische behandlung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7183090B2 (en) 2000-05-23 2007-02-27 Valtion Teknillinen Tutkimuskeskus Laccase enzyme and the gene encoding the enzyme

Also Published As

Publication number Publication date
ATE100157T1 (de) 1994-01-15
FI893338A (fi) 1991-01-11
NO893715L (no) 1991-01-11
EP0408803A1 (en) 1991-01-23
JP2831048B2 (ja) 1998-12-02
FI88316C (fi) 1993-04-26
JPH03130485A (ja) 1991-06-04
DE68912322D1 (de) 1994-02-24
ES2061857T3 (es) 1994-12-16
CA1335184C (en) 1995-04-11
NO175105C (no) 1994-08-31
FI88316B (fi) 1993-01-15
NO893715D0 (no) 1989-09-18
FI893338A0 (fi) 1989-07-10
NO175105B (no) 1994-05-24

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