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WO1992009741A1 - Procede de blanchiment de pate - Google Patents

Procede de blanchiment de pate Download PDF

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Publication number
WO1992009741A1
WO1992009741A1 PCT/FI1991/000329 FI9100329W WO9209741A1 WO 1992009741 A1 WO1992009741 A1 WO 1992009741A1 FI 9100329 W FI9100329 W FI 9100329W WO 9209741 A1 WO9209741 A1 WO 9209741A1
Authority
WO
WIPO (PCT)
Prior art keywords
bleaching
pulp
oxidizing enzyme
test
enzyme
Prior art date
Application number
PCT/FI1991/000329
Other languages
English (en)
Inventor
Marja Vaheri
Outi Piirainen
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
Application filed by Enso-Gutzeit Oy filed Critical Enso-Gutzeit Oy
Publication of WO1992009741A1 publication Critical patent/WO1992009741A1/fr

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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
    • 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

Definitions

  • the present invention relates to a method for bleaching pulp, whereby an oxidizing enzyme and a chlorine-containing bleaching chemical are used in the method.
  • Pulp from sulfate cooking in particular has a brown colour which is mainly related to residual lignin in the pulp.
  • Lignin is removed by bleaching that generally is a multistage process in which the pulp is alternately treated by oxidizing, lignin-degrading chemicals and the compounds resulting from lignin degradation are further treated by dissolving chemicals.
  • Oxidizing chemicals most generally applied are chlorine-containing compounds, while the chemicals employed for removing the degradation components typically are alkaline solutions.
  • Chlorine-containing bleaching chemicals convert in the bleaching reactions the lignin contained in the pulp into organic chlorine compounds, which are carried away along with the waste water from the bleaching process. Due to the possible toxicity of the organic chlorine compounds contained in the waste waters of the bleaching process, these waste waters pose a problem in terms of environmental protection; and furthermore, the waste waters of the bleaching process have an intolerably high level of chemical oxygen demand. Because the measures taken by sulfate pulp plants for reduction of pollutant discharges to the environment have so far mainly been focused on other stages of the pulping process than bleaching, the relative proportion of bleaching in the discharges has grown steadily.
  • Patent application FI 892803 discloses a method in which lignin peroxidase can bleach cellulosic pulp in closely controlled conditions of a reaction solution containing a plurality of expensive chemical compounds. In practice, however, such a process is impossible to utilize due to its economic constraints.
  • the enzyme, lignin peroxidase, used in the process cannot be produced in sufficient quantities so as to make an industrial application possible. Therefore, the present invention seeks to achieve a method in which pulp can be bleached with the help of an enzyme produced on an industrial scale by applying said enzyme under conditions which are feasible on an industrial scale, thus avoiding the use of costly chemicals.
  • the invention is characterized in that said method makes an additional use of a transitional element metal and if necessary, a control of redox potential in the bleaching process.
  • an oxidizing enzyme When used for the delignification of cellulosic pulp, it is essential to control the progress of the delignification process by adjusting the redox potential level. Depending on the redox potential level, the oxidizing enzyme either delignifies or polymerizes the lignin of the pulp. Due to the physical character of pulp, however, the measurement of redox potential level in practice has turned out to be difficult. To avoid this problem, it has been found in conjunction with the use of a transitional element metal in the oxidizing enzyme treatment that it is possible to omit, when desirable, the control of the redox potential level, or alternatively, it can be much coarser than is possible without the utilization of a transitional element metal.
  • the use of a transitional element metal in conjunction with an oxidizing enzyme in the method according to the invention facilitates delignification with improved efficiency, and thus makes it possible to reduce the consumption of chlorine chemicals in the bleaching of cellulosic pulp and the residual content of organic chlorine compounds in waste waters from the bleaching stage.
  • the transitional element metal advantageously used in the method according to the invention is manganese which a relatively abundant metal and thus advantageous to use on an industrial scale nor has any negative effect on the product itself.
  • the aforementioned does not, however, exclude the use of other similar element metals either alone, or alternatively, in combinations by way of the method according to the present invention.
  • the oxidizing enzyme used in the above-described method is advantageously phenol oxidase, also called laccase, which so far is the only lignin-oxidizing enzyme that can be manufactured at reasonable cost on an industrial scale in sufficient quantities.
  • softwood pulp is subjected in the middle of the bleaching sequence, after the first chlorination, the first alkaline treatment and the first chlorine dioxide treatment stages to a laccase treatment in the presence of manganese. After the treatment the pulp is washed with water and alkaline chemicals.
  • the enzyme treatment is advantageously carried out at 10...90 °C temperature, preferably at 40...80 °C, and at a pH of 2.0...11.0, preferably at pH 3.0...6.0.
  • the manganese compound advantageously used is manganese sulfate in concentrations from 10 g to 10 kg per 1 ton dry pulp, preferably from 100 g to 5 kg per 1 ton dry pulp.
  • the invention also concerns the use of a transitional element metal, preferable manganese, in conjunction with an oxidizing enzyme, for the purpose of reducing the content of chlorine-containing bleaching chemical in the pulp being bleached and the content of organic chlorine compounds in the waste waters from the bleaching stage.
  • a transitional element metal preferable manganese
  • the birch pulp used in the test was commercial pulp which was semibleached in a sequence D0-E1- E0-D1, washed with water and centrifuged to a 30 % solids content.
  • the empty reaction vessel was additionally rinsed with 575 ml of 0.5 M sodium hydroxide and the rinsings were poured into the filter funnel.
  • the pulp was recovered by vacuum filtration, suspended in approx. 5 1 of distilled water, and the suspension was acidified with 2 N sulfuric acid to a pH of 4...5 and filtered by vacuum filtration. After these steps, the brightness of the pulp was determined.
  • Test 2 (reference test 2): The pulp was not treated with laccase enzyme nor manganese sulfate, but instead, these components were replaced by distilled water. For other parts, the test was similar to the test (Test 1) described above.
  • Test 3 (reference test 3): The pulp was subjected to laccase enzyme treatment alone. For other parts, the test was similar to the test (Test 1) described above.
  • Test 4 (reference test 4): The pulp was subjected to manganese sulfate treatment alone. For other parts, the test was similar to the test (Test 1) described above.
  • the test verifies that the pulp can be bleached by a treatment in accordance with the present invention by virtue of the employed enzyme and transitional element metal in industrially feasible conditions of low environmental impact.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Paper (AREA)

Abstract

L'invention se rapporte à un procédé de blanchiment de pâte de cellulose, ladite invention comprenant l'utilisation d'une enzyme d'oxydation. L'invention se caractérise en ce qu'un élément métallique de transition tel que du manganèse est utilisé selon le procédé, et, lorsque cela s'avère nécessaire, le niveau du potentiel redox du procédé de blanchiment est régulé. Selon le procédé, de la laccase peut ètre avantageusement utilisée comme enzyme d'oxydation. Ledit procédé permet de réduire efficacement la consommation de produits chimiques à base de chlore dans le blanchiment de pâte de cellulose ainsi que la teneur résiduelle en composés de chlore organique des eaux usées provenant de l'étape de blanchiment.
PCT/FI1991/000329 1990-12-03 1991-10-31 Procede de blanchiment de pate WO1992009741A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI905954A FI905954L (fi) 1990-12-03 1990-12-03 Foerfarande foer blekning av cellulosamassa.
FI905954 1990-12-03

Publications (1)

Publication Number Publication Date
WO1992009741A1 true WO1992009741A1 (fr) 1992-06-11

Family

ID=8531508

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000329 WO1992009741A1 (fr) 1990-12-03 1991-10-31 Procede de blanchiment de pate

Country Status (2)

Country Link
FI (1) FI905954L (fr)
WO (1) WO1992009741A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691193A (en) * 1993-02-25 1997-11-25 Pulp And Paper Research Institute Of Canada Non-chlorine bleaching of kraft pulp
WO2000052257A1 (fr) * 1999-03-04 2000-09-08 Consortium Für Elektrochemischen Industrie Gmbh Systeme multicomposant pour l'oxydation de substrats catalysee par des enzymes et procede d'oxydation catalysee par des enzymes
WO2003035972A1 (fr) * 2001-10-23 2003-05-01 Novozymes A/S Enzymes d'oxydation utilisees dans la fabrication de materiaux papiers
US6660128B1 (en) 1998-04-16 2003-12-09 Pulp And Paper Research Institute Of Canada Oxidase process for pulp
US7138035B2 (en) 2001-05-08 2006-11-21 National Starch And Chemical Investment Holding Corporation Process for the selective modification of carbohydrates by peroxidase catalyzed oxidation
WO2006126983A1 (fr) 2005-05-04 2006-11-30 Novozymes North America, Inc. Compositions et procedes de traitement au dioxyde de chlorure
US9051692B2 (en) 2009-01-06 2015-06-09 Enzymatic Deinking Technologies, L.L.C. Method of increasing enzyme stability and activity for pulp and paper production
CN116219785A (zh) * 2023-02-27 2023-06-06 安徽金坤达包装集团有限公司 一种锰氧化物耦合漆酶原位降解木质素的方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003190A1 (fr) * 1986-10-24 1988-05-05 Call Hans Peter Procede de production de cellulose a partir de matieres premieres contenant de la lignine
EP0345715A1 (fr) * 1988-06-08 1989-12-13 International Paper Company Délignification enzymatique de matériau lignocellulosique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003190A1 (fr) * 1986-10-24 1988-05-05 Call Hans Peter Procede de production de cellulose a partir de matieres premieres contenant de la lignine
EP0345715A1 (fr) * 1988-06-08 1989-12-13 International Paper Company Délignification enzymatique de matériau lignocellulosique

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691193A (en) * 1993-02-25 1997-11-25 Pulp And Paper Research Institute Of Canada Non-chlorine bleaching of kraft pulp
US6660128B1 (en) 1998-04-16 2003-12-09 Pulp And Paper Research Institute Of Canada Oxidase process for pulp
WO2000052257A1 (fr) * 1999-03-04 2000-09-08 Consortium Für Elektrochemischen Industrie Gmbh Systeme multicomposant pour l'oxydation de substrats catalysee par des enzymes et procede d'oxydation catalysee par des enzymes
AU750461B2 (en) * 1999-03-04 2002-07-18 Consortium Fur Elektrochemische Industrie Gmbh Multi-component system for the enzyme-catalysed oxidation of substrates and method for carrying out enzyme-catalysed oxidation
US7138035B2 (en) 2001-05-08 2006-11-21 National Starch And Chemical Investment Holding Corporation Process for the selective modification of carbohydrates by peroxidase catalyzed oxidation
WO2003035972A1 (fr) * 2001-10-23 2003-05-01 Novozymes A/S Enzymes d'oxydation utilisees dans la fabrication de materiaux papiers
WO2006126983A1 (fr) 2005-05-04 2006-11-30 Novozymes North America, Inc. Compositions et procedes de traitement au dioxyde de chlorure
EP1880053A4 (fr) * 2005-05-04 2013-01-23 Novozymes North America Inc Compositions et procedes de traitement au dioxyde de chlorure
US9051692B2 (en) 2009-01-06 2015-06-09 Enzymatic Deinking Technologies, L.L.C. Method of increasing enzyme stability and activity for pulp and paper production
CN116219785A (zh) * 2023-02-27 2023-06-06 安徽金坤达包装集团有限公司 一种锰氧化物耦合漆酶原位降解木质素的方法

Also Published As

Publication number Publication date
FI905954A7 (fi) 1992-06-04
FI905954A0 (fi) 1990-12-03
FI905954L (fi) 1992-06-04

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