EP0513140B2 - Procede de blanchiment de pulpe chimique - Google Patents

Procede de blanchiment de pulpe chimique Download PDF

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Publication number
EP0513140B2
EP0513140B2 EP91903684A EP91903684A EP0513140B2 EP 0513140 B2 EP0513140 B2 EP 0513140B2 EP 91903684 A EP91903684 A EP 91903684A EP 91903684 A EP91903684 A EP 91903684A EP 0513140 B2 EP0513140 B2 EP 0513140B2
Authority
EP
European Patent Office
Prior art keywords
pulp
enzyme
bleaching
steps
treatment
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
EP91903684A
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German (de)
English (en)
Other versions
EP0513140A1 (fr
EP0513140B1 (fr
Inventor
Marja Vaheri
Kimmo Ruohoniemi
Hannu Sonni
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
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Publication date
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Application filed by Enso Gutzeit Oy filed Critical Enso Gutzeit Oy
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Publication of EP0513140B2 publication Critical patent/EP0513140B2/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
    • D21C9/1057—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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/142—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 in a multistage process involving ClO2/Cl2 exclusively
    • 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
    • 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Definitions

  • the present invention relates to a process for the bleaching of chemical pulp as set forth in the preamble of claim 1.
  • the chemical pulp obtained by sulfate cooking is brown in color, which is mainly due to lignin remaining in the pulp.
  • Lignin is removed by bleaching, which is usually a multiple-step process in which the pulp is treated alternately with oxidizing chemicals which decompose lignin and with chemicals which dissolve the substances produced as products of the decomposition.
  • oxidizing chemicals have been chorine-containing substances and oxygen, whereas alkali solutions have been used as chemicals removing the decomposition products.
  • the chlorine-containing bleaching chemicals When reacting, the chlorine-containing bleaching chemicals convert the lignin present in the pulp into organic chlorine compounds. which will pass into the bleaching effluents removed from the pulp.
  • the bleaching effluents constitute an environmental problem owing to the potential toxicity of the organic chlorine compounds passing into the effluents, and also the values of chemical oxygen consumption in the bleaching effluents are detrimentally high.
  • the bleaching effluents which load the environment the worst are produced in the washing steps following the first chlorination and the first alkali step of the bleaching.
  • Efforts have been made to decrease the load by various methods. for example by replacing the chlorine gas with chlorine dioxide or by using oxygen as the oxidizing chemical in the first step.
  • fully satisfactory results have not been achieved by these methods.
  • Efforts to decrease the quantities of chlorophenols and other toxic chlorine compounds in the effluents have inceed been successful, but the values of chemical oxygen consumption of the effluents have not decreased. Therefore, effective biological purification has been needed to back up the said methods.
  • the object of the present invention is to provide a new method, based on enzyme treatment of pulp, by which pulp can be bleached in such a manner that the need for bleaching chemicals decreases and at the same time the chemical oxygen consumption and toxicity of the bleaching effluent decrease so that the need for water purification will be smaller. It is characteritic of the invention that the pulp is treated with an enzyme, selected from hemicellulase, cellulase, pectinase and esterase, in two separate enzyme treatment steps of the bleaching process, wherein the pulp subsequent to each enzyme treatment step is treated in an oxidation step.
  • an enzyme selected from hemicellulase, cellulase, pectinase and esterase
  • At least one enzyme treatment step is followed in the process by a treatment with alkali, in which an oxidizing chemical, such as oxygen or peroxide, is used besides the alkali. It has been cbserved that such an oxidizing alkali treatment decreases especially effectively the need for chlorine chemicals in bleaching.
  • an oxidizing chemical such as oxygen or peroxide
  • the enzyme treatments break down the hemicellulose and/or lignin present in the pulp and make the pulp more porous, thus increasing the action of the chemicals in subsequent pulp treatment steps.
  • the enzyme treatment may be followed by a washing of the pulp, removing constituents broken down from the pulp; these constituents can be led to a burning so that they will cause no effluent load but the energy contained in them can be exploited in the energy supply of the mill.
  • the pulp bleaching according to the invention can be carried out in the conventional manner so that the oxidation and alkali steps alternate. After the various steps the pulp can be washed in order to remove the bleaching chemicals and the broken-down constituents.
  • the enzyme treatment is preferably carried out within a temperature range of 10-90 °C, preferably within 40-80 °C, and at a pH of 3.3-11.0, preferably 4.0-10.0.
  • the enzyme used may be hemicellulase, cellulase. pectinase, esterase, or a mixture of the same. Hemicellulases are particularly preferred.
  • the pulp was subjected to an oxidizing bleaching treatment by using a mixture which contained 50 % chlorine dioxide and 50 % chlorine gas.
  • the mixture was proportioned at 2.0 x the kappa number after the pulping.
  • the treatment temperature was 40 °C and the treatment time 45 min and the consistency of the pulp 3.5 %.
  • the pulp was subjected to an alkali treatment by using a 2-% sodium hydroxide solution the proportion of which was 0.9 x kappa.
  • the consistency of the mixture was 10 %, and the treatment temperature was 60 °C and the treatment time 90 min.
  • the pulp was washed with a 20-fold amount of water.
  • the bleaching was continued by repeating the enzyme step by using the same enzyme mixture as in the first step and the oxidation step by using chlorine dioxide and by washing the pulp between the steps as described above.
  • the amount of enzyme in the second enzyme treatment was 2.5 U/g of pulp.
  • the amount of chlorine dioxide in the second oxidizing step was 1.5 % of the amount of the pulp being bleached.
  • Experiment 1 reference exceriment: the pulp was not subjected to a second enzyme treatment. In other respects the experiment corresponded to that described above (Experiment 2).
  • Experiment 1 reference
  • Experiment 2 1st enzyme treatment 1 1 - enzyme proportion (l/t) ClO 2 /Cl ratio 50/50 50/50 Kappa 27.7 27.7 pH - enzyme step 5.4 5.6 - oxidation step (ClO 2 /Cl) 2.1 2.1 - alkali step 11.7 11.6 Consumption of active chlorine (%) 5.54 5.54 Intermediate kappa 5.7 5.7 2nd enzyme treatment (l/t) - 0.5 pH - 2nd enzyme step 5.3 - oxidation step (ClO 2 ) 2.1 2.1 - SO 2 step beginning/end 4.8/3.7 4.8/3.7 Whiteness (ISO) 60.97 67.54

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Paper (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Hard Magnetic Materials (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Claims (5)

  1. Procédé de blanchiment de pâte chimique, qui comprend au minimum une étape d'oxydation et au minimum une étape de traitement alcalin et dans lequel la pâte est traitée de manière enzymatique, caractérisé en ce que la pâte est traitée au moins avec une enzyme, choisie parmi l'hémicellulase, la cellulase, la pectinase et l'estérase, dans deux étapes séparées de traitement enzymatique du procédé de blanchiment, dans lequel la pâte, après chaque étape de traitement enzymatique, est traitée par une étape d'oxydation.
  2. Procédé selon la revendication 1, caractérisé en ce que le produit chimique oxydant utilisé dans une ou plusieurs étapes du procédé est l'oxygène.
  3. Procédé selon l'une quelconque des revendications ci-dessus, caractérisé en ce que au moins une étape de traitement enzymatique est suivie dans le procédé par un traitement alcalin dans lequel un produit chimique oxydant, comme l'oxygène ou un peroxyde, est utilisé en plus de l'alcalin.
  4. Procédé selon l'une quelconque des revendications ci-dessus, caractérisé en ce que au minimum deux enzymes différentes sont utilisées.
  5. Procédé selon l'une quelconque des revendications ci-dessus, caractérisé en ce que le procédé est utilisé pour le blanchiment d'une pâte obtenue à partir de bois tendre, comme la pâte de sapin au sulfate.
EP91903684A 1990-02-02 1991-02-01 Procede de blanchiment de pulpe chimique Expired - Lifetime EP0513140B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI900549A FI89814C (fi) 1990-02-02 1990-02-02 Foerfarande foer blekning av cellulosamassa
FI900549 1990-02-02
PCT/FI1991/000033 WO1991011553A1 (fr) 1990-02-02 1991-02-01 Procede de blanchiment de pulpe chimique

Publications (3)

Publication Number Publication Date
EP0513140A1 EP0513140A1 (fr) 1992-11-19
EP0513140B1 EP0513140B1 (fr) 1995-09-27
EP0513140B2 true EP0513140B2 (fr) 1998-03-18

Family

ID=8529828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91903684A Expired - Lifetime EP0513140B2 (fr) 1990-02-02 1991-02-01 Procede de blanchiment de pulpe chimique

Country Status (8)

Country Link
EP (1) EP0513140B2 (fr)
JP (1) JPH05509362A (fr)
AT (1) ATE128498T1 (fr)
CA (1) CA2075187A1 (fr)
DE (1) DE69113444D1 (fr)
ES (1) ES2079062T5 (fr)
FI (1) FI89814C (fr)
WO (1) WO1991011553A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7541175B1 (en) 2000-12-22 2009-06-02 Iogen Energy Corporation Alkaline extraction stages comprising xylanase

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI90670C (sv) * 1991-05-02 1994-03-10 Metsae Serla Oy Behandling av alkalibehandlad massa för användning i pappersframställning
US7816129B2 (en) 1994-07-29 2010-10-19 Ab Enzymes Gmbh Production and secretion of proteins of bacterial origin in filamentous fungi
EP0905306A1 (fr) 1997-09-26 1999-03-31 Consortium für elektrochemische Industrie GmbH Système à plusieurs constituants pour modifier, dégrader ou blanchir la lignine ou les matières contenant de la lignine ainsi que procédé l'utilisant
WO2000014243A1 (fr) 1998-09-04 2000-03-16 University Of Georgia Research Foundation, Inc. Esterases d'acide phenolique, sequences de codage et procedes
US6602700B1 (en) 1998-09-04 2003-08-05 University Of Georgia Research Foundation, Inc. Phenolic acid esterases, coding sequences and methods
AU2002229430A1 (en) * 2001-01-18 2002-07-30 Iogen Bio-Products Corporation Use of xylanase in pulp bleaching
US7368036B2 (en) * 2002-03-06 2008-05-06 Iogen Bio-Products Corporation Xylanase treatment of chemical pulp
EP1516053B1 (fr) 2002-06-14 2012-10-17 Verenium Corporation Xylanases, acides nucleiques les codant et leurs procedes de fabrication et d'utilisation
EP3406621A1 (fr) 2006-02-14 2018-11-28 BP Corporation North America Inc. Xylanases, acides nucléiques les codant et leurs procédés de fabrication et d'utilisation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI90888B (fi) * 1989-02-14 1993-12-31 Enso Gutzeit Oy Menetelmä selluloosamassan valkaisemiseksi
ZA904441B (en) * 1989-06-22 1991-03-27 Int Paper Co Enzymatic delignification of lignocellulosic material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7541175B1 (en) 2000-12-22 2009-06-02 Iogen Energy Corporation Alkaline extraction stages comprising xylanase

Also Published As

Publication number Publication date
FI89814B (fi) 1993-08-13
FI89814C (fi) 1993-11-25
ATE128498T1 (de) 1995-10-15
DE69113444D1 (de) 1995-11-02
FI900549A0 (fi) 1990-02-02
ES2079062T5 (es) 1998-07-16
WO1991011553A1 (fr) 1991-08-08
CA2075187A1 (fr) 1991-08-03
EP0513140A1 (fr) 1992-11-19
EP0513140B1 (fr) 1995-09-27
JPH05509362A (ja) 1993-12-22
FI900549A (fi) 1991-08-03
ES2079062T3 (es) 1996-01-01

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