EP0383999B1 - Procédé de blanchiment de pâte - Google Patents

Procédé de blanchiment de pâte Download PDF

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Publication number
EP0383999B1
EP0383999B1 EP89117235A EP89117235A EP0383999B1 EP 0383999 B1 EP0383999 B1 EP 0383999B1 EP 89117235 A EP89117235 A EP 89117235A EP 89117235 A EP89117235 A EP 89117235A EP 0383999 B1 EP0383999 B1 EP 0383999B1
Authority
EP
European Patent Office
Prior art keywords
pulp
bleaching
treatment
oxidation
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.)
Revoked
Application number
EP89117235A
Other languages
German (de)
English (en)
Other versions
EP0383999A3 (en
EP0383999A2 (fr
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
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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=EP0383999(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 AT89117235T priority Critical patent/ATE103351T1/de
Publication of EP0383999A2 publication Critical patent/EP0383999A2/fr
Publication of EP0383999A3 publication Critical patent/EP0383999A3/en
Application granted granted Critical
Publication of EP0383999B1 publication Critical patent/EP0383999B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • 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

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 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 oxygen and chlorine-containing chemicals such as pure chlorine gas, chlorine dioxide and sodium and calcium hypochlorites, whereas alkali solutions are used for eliminating the degradation products.
  • the spent bleach liquors causing the worst environmental pollution load are produced during the washing following the first chlorination and the first alkali treatment in the bleaching process.
  • various methods have been employed, e.g. the so-called extended digestion, the use of chlorine dioxide as an oxidating bleaching chemical, oxygen bleaching and biological purification of the spent bleach liquor.
  • the results achieved by these methods are not completely satisfactory.
  • the amounts of chlorophenols and other toxic chlorine compounds in the spent bleach liquor have been significantly reduced by employing chlorine dioxide and 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.
  • WO-A-8 908 738 discloses the effect of the enzyme treatment on the reduction of the chlorine content of bleached pulp.
  • chlorine chemicals are used in the bleach, and example 3 discloses a chlorine dioxide content of 10 percent.
  • CA-A-1 086 905 discloses a bleaching with a high content of chlorine dioxide, but without any enzyme treatment.
  • enzyme treatment substantially reduces the amount of organic chlorine compounds in the spent bleach liquor while at the same time reducing its chemical oxygen demand, especially when at least 70 % of the bleaching chemical used in the oxidation stage consists of chlorine dioxide. If pure chlorine gas is used, enzyme treatment has a substantially weaker effect on the quality of the spent bleach liquor.
  • the pulp is subjected to enzyme treatment and washing before the first oxidation stage.
  • the enzyme breaks down hemicellulose and/or lignin contained in the pulp and renders the pulp more spongy, thus enhancing the effect of the chemicals in subsequent oxidation and alkali treatment stages.
  • the degradation products are removed and can be burned so that they will not contribute to the effluent emissions at all.
  • the bleaching of pulp by the procedure of the invention can be performed in the conventional manner by employing alternate oxidation and alkali treatment phases and washing the pulp after each of these phases 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 40-75 °C, with pH values in the range 3.0-10.0, preferably 4.0-9.0.
  • the enzyme used can be a hemicellulase, cellulase, pectinase, esterase or a mixture of these.
  • a diluted enzyme mixture (streptomyces hemicellulase) was added to 220 g of dry matter obtained from birch sulphate pulp (with a dry matter content of 30%) so that a mixture with a consistency of 10% and xylanase activity of 5 U/g of pulp dry matter was obtained.
  • the temperature in the enzyme treatment was 55 °C, the duration of treatment 2 h and pH 8.0.
  • the pulp was subjected to an oxidating bleaching treatment using a mixture containing 90 % chlorine dioxide and 10 % chlorine gas, in a dosage equal to 1.4 x post-enzyme-treatment kappa number of the pulp.
  • Treatment temperature was 55 °C and duration of treatment 45 min.
  • the pulp was washed in a Büchner funnel with a 20-fold amount of water.
  • the pulp was subjected to an alkali treatment using a 5 % sodium hydroxide solution in a dosage of 0.8 x kappa. Consistency of the mixture was 10 %, treatment temperature 60 °C and duration of treatment 90 min. After the alkali treatment the pulp was washed in the same way as after the oxidation phase.
  • a diluted enzyme mixture (streptomyces hemicellulase) 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 xylanase activity of 5 U/g of pulp dry matter was obtained.
  • the temperature in the enzyme treatment was 55 °C, the duration of treatment 2 h and pH 8.5.
  • the pulp was subjected to an oxidating bleaching treatment using a mixture which contained 80 % chlorine dioxide and 20 % chlorine gas.
  • the dosage of the mixture was 1.4 x kappa number of the pulp after enzyme treatment.
  • Treatment temperature was 55 °C and duration of treatment 45 min.
  • the pulp was washed in a Büchner funnel with a 20-fold amount of water.
  • the pulp was subjected to an alkali treatment using a 5 % sodium hydroxide solution in a dosage of 0.9 x kappa. Consistency of the mixture was 2 %, treatment temperature 45-55 °C and duration of treatment 90 min. After the alkali treatment the pulp was washed in the same way as after the oxidation phase.

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)

Claims (6)

  1. Procédé de blanchiment de pâte, dans lequel on utilise un produit chimique de blanchiment oxydant contenant du chlore, caractérisé en ce que, dans l'étape d'oxydation, on utilise un produit chimique présentant une teneur en dioxyde de chlore d'au moins 70 %, en ce que la pâte est soumise à un traitement par une enzyme avant l'oxydation, et en ce que, après l'oxydation et le traitement à l'enzyme, la pâte est traitée par un alcali.
  2. Procédé selon la revendication 1, caractérisé en ce que le produit chimique de blanchiment utilisé dans l'étape d'oxydation, est un mélange contenant du chlore gazeux en plus du dioxyde de chlore.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la pâte est traitée par une enzyme et lavée avant la première étape d'oxydation.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, après l'étape d'oxydation, la pâte est lavée puis le processus de blanchiment se poursuit par un traitement à l'alcali.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le traitement à l'enzyme est effectué dans une plage de températures de 10 à 90°C, et de préférence de 40 à 75°C, avec des valeurs de pH se situant dans la plage de 3,0 à 10,0 et de préférence de 4,0 à 9,0.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'enzyme utilisée est une hémicellulase, une cellulase, une pectinase, une estérase, ou un mélange de ces produits.
EP89117235A 1989-02-14 1989-09-18 Procédé de blanchiment de pâte Revoked EP0383999B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89117235T ATE103351T1 (de) 1989-02-14 1989-09-18 Verfahren zum bleichen von zellstoff.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI890700 1989-02-14
FI890700A FI90888B (fi) 1989-02-14 1989-02-14 Menetelmä selluloosamassan valkaisemiseksi

Publications (3)

Publication Number Publication Date
EP0383999A2 EP0383999A2 (fr) 1990-08-29
EP0383999A3 EP0383999A3 (en) 1990-12-12
EP0383999B1 true EP0383999B1 (fr) 1994-03-23

Family

ID=8527891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117235A Revoked EP0383999B1 (fr) 1989-02-14 1989-09-18 Procédé de blanchiment de pâte

Country Status (8)

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

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI86896B (fi) * 1989-05-04 1992-07-15 Enso Gutzeit Oy Foerfarande foer blekning av cellulosamassa.
SE465320B (sv) * 1990-01-10 1991-08-26 Korsnaes Ab Preparat som uppvisar enzymatisk delignifieringsaktivitet, saett att framstaella detsamma och tillaempningar daerav
FI89814C (fi) * 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 (ja) * 1990-07-24 1999-02-17 ノボ ノルディスク アクティーゼルスカブ セルラーゼ及びその製造法
DK203490D0 (da) * 1990-08-24 1990-08-24 Novo Nordisk As Fremgangsmaade til behandling af lignocellulosepulp og apparat til udfoerelse af processen
DE4129739A1 (de) * 1990-09-11 1992-03-12 Sandoz Ag Chlorfreies bleichen von papierpulpe
FI108800B (fi) * 1991-05-07 2002-03-28 Iogen Corp Menetelmä ja laitteisto entsyymin käyttämiseksi paperimassan valmistuksessa ja valkaisussa
CA2044100A1 (fr) * 1991-06-07 1992-12-08 Janice Hamilton Procede de bioblanchiment
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 (de) * 1994-06-17 1995-12-21 Melitta Haushaltsprodukte Verfahren zum Delignifizieren und Bleichen von ungebleichten Zellstoffsuspensionen unter Verwendung von Stickstoffverbindungen
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
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
WO2002057541A2 (fr) 2001-01-18 2002-07-25 Iogen Bio-Products Corporation Procedes permettant un traitement de blanchiment a l'aide de xylanases
WO2003074780A1 (fr) * 2002-03-06 2003-09-12 Iogen Bio-Products Corporation Traitement de pate chimique par des xylanases

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1086905A (fr) * 1977-10-25 1980-10-07 W. Howard Rapson Fonctionnement d'une installation de blanchiment
JPS5468402A (en) * 1977-11-09 1979-06-01 Kogyo Gijutsuin Property modification of biochemical pulp
FI81395B (fi) * 1988-03-14 1990-06-29 Cultor Oy Foerfarande foer blekning av cellulosamassa.

Also Published As

Publication number Publication date
FI890700A0 (fi) 1989-02-14
EP0383999A3 (en) 1990-12-12
EP0383999A2 (fr) 1990-08-29
FI90888B (fi) 1993-12-31
DE68914135D1 (de) 1994-04-28
NO893714L (no) 1990-08-15
NO893714D0 (no) 1989-09-18
ATE103351T1 (de) 1994-04-15
JPH02221482A (ja) 1990-09-04
NO176406B (no) 1994-12-19
CA1339594C (fr) 1997-12-23
NO176406C (no) 1995-03-29
FI890700A (fi) 1990-08-15
ES2050747T3 (es) 1994-06-01

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