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WO1994011568A1 - Procede de blanchiment de pate de cellulose - Google Patents

Procede de blanchiment de pate de cellulose Download PDF

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Publication number
WO1994011568A1
WO1994011568A1 PCT/FI1993/000362 FI9300362W WO9411568A1 WO 1994011568 A1 WO1994011568 A1 WO 1994011568A1 FI 9300362 W FI9300362 W FI 9300362W WO 9411568 A1 WO9411568 A1 WO 9411568A1
Authority
WO
WIPO (PCT)
Prior art keywords
stage
accordance
pulp
bleaching
peroxide
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.)
Ceased
Application number
PCT/FI1993/000362
Other languages
English (en)
Inventor
Håkan FINNE
Kaj Henricson
Uno Lundgren
Ingvar Ollandt
Kenneth Winberg
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.)
Ahlstrom Corp
Original Assignee
Ahlstrom Corp
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 Ahlstrom Corp filed Critical Ahlstrom Corp
Priority to EP93919365A priority Critical patent/EP0669999A1/fr
Priority to JP6511734A priority patent/JPH08503267A/ja
Priority to FI952258A priority patent/FI952258A0/fi
Priority to BR9307443A priority patent/BR9307443A/pt
Publication of WO1994011568A1 publication Critical patent/WO1994011568A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • D21C9/1057—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
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
    • 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 method of bleaching pulp. It relates especially to novel pro-environmental bleaching process types used in the wood-processing in ⁇ dustry, in which methods the chlorine chemicals are replaced by other bleaching chemicals involving dis ⁇ charges less harmful to the environment.
  • Cellulose pulp is traditionally bleached with chlorine- containing chemicals, such as chlorine gas and chlorine dioxide.
  • chlorine- containing chemicals such as chlorine gas and chlorine dioxide.
  • the chlorine compounds generating in bleaching processes are unpleasent because they are malodorous and also because they cause problems in the purification of the effluents.
  • the environmental requirements on the cellulose industry have become more strict, and therefore there is a tendency to use more and more chlorine-free/non-chlorine bleaching chemicals, such as peroxide and ozone.
  • Peroxide and ozone bleaching are both known bleaching processes. However, replacing chlorine chemicals with peroxide or ozone has not always led to final products of sufficient quality.
  • the present invention relates to a method of bleaching pulp in such a way that peroxide and ozone bleaching is intensified with metal stripping, acidation and enzyme treatment.
  • a Q refers to acid stage, in which a complex former, such as EDTA, is used for removing metal ions.
  • a complex former such as EDTA
  • a eQ refers to acidation stage, in both the complex former and entzymes are used.
  • Complex formers are substances, which are used for removing metal ions from the pulp stock because the metal ions decompose peroxide and ozone and thus decrease the bleaching efficiency.
  • Entzymes are used for treating the fibers in such a way that the bleaching chemicals may more readily affect the lignin. Entzymes partly cause the fiber walls to swell and partly open pores.
  • hot alkali extraction stage is an alkali stage, in which the temperature is above 90°C, preferably above 100°C.
  • the pores of the fiber swell in such a way that the bleaching chemical is better able to react and also the residual lignin may be more readily extracted from the fiber walls.
  • the phenomenon illustrated in the above example 1 may be utilized in many ways.
  • the brightness may further be increased by using ozone.
  • An ozone stage is preferably added to follow the acid stage, because ozone requires acid conditions to act.
  • Appropriate points for ozone bleaching are pointed out in the following sequence with (Z). Normally it is reasonable to add one or two ozone stages at most in a bleaching sequence.
  • the sequences using ozone as an additional chemical for peroxide bleaching, are thus: 0-A Q -( Z )-P-A e -(Z )-P-(Z ) .
  • the combination A e Z means that there is no washing between the A- and Z- stages.
  • the dash “-" means that there is either a washing or pressing stage between the stages.
  • HAE-stage between the peroxide stages has not yet been tested more accurately in the laboratory. Since the peroxide stages are hot, it might be possible to position a HAE-stage between the P-stages.
  • the purpose of the HAE-stage would correspond to that of A e -stage.
  • the temperature of the HAE-stage might be, for example, 120°C.
  • a suitable bleaching sequence would therefore be, for example,
  • HAE-stage HAE-stage
  • HAE p peroxide to the HAE-stage
  • the sequence might then be 0-A Q - P-HAE p -Z or 0-A Q -HAE p -P-Z, although the ozone stage may, if required, also be positioned subsequent to the A Q -stage either to replace the ozone stage in the above described sequence or to add a second ozone stage to the sequence.
  • the pulp was digested to a kappa number 20-25 prior to the oxygen bleaching, in which the kappa number decreased to 12 - 16.
  • the bleaching sequence subsequent to the digestion was 0-A eQ -EPO-A e -P.
  • EPO means peroxide stage, in which also oxygen is used.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un procédé pour blanchir la pâte de cellulose et en particulier de nouveaux types de procédés de blanchiment plus acceptables pour l'environnement, qui sont destiné à l'industrie de transformation du bois. Dans ces procédés, les produits chimiques à base de chlore sont remplacés par d'autres produits chimiques de blanchiment moins nocifs pour l'environnement. Un trait caractéristique de l'invention est que le blanchiment comporte au moins deux étapes de traitement par un peroxyde entre lesquelles les fibres sont soumises à un traitement d'activation, par exemple une acidification ou une extraction alcaline à chaud.
PCT/FI1993/000362 1992-11-13 1993-09-14 Procede de blanchiment de pate de cellulose Ceased WO1994011568A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP93919365A EP0669999A1 (fr) 1992-11-13 1993-09-14 Procede de blanchiment de pate de cellulose
JP6511734A JPH08503267A (ja) 1992-11-13 1993-09-14 パルプ漂白法
FI952258A FI952258A0 (fi) 1992-11-13 1993-09-14 Menetelmä massan valkaisemiseksi
BR9307443A BR9307443A (pt) 1992-11-13 1993-09-14 Processo para alvejar polpa com produtos químicos isentos de cloro

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI925159A FI925159A0 (fi) 1992-11-13 1992-11-13 Foerfarande foer blekning av massa
FI925159 1992-11-13

Publications (1)

Publication Number Publication Date
WO1994011568A1 true WO1994011568A1 (fr) 1994-05-26

Family

ID=8536209

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1993/000362 Ceased WO1994011568A1 (fr) 1992-11-13 1993-09-14 Procede de blanchiment de pate de cellulose

Country Status (6)

Country Link
EP (1) EP0669999A1 (fr)
JP (1) JPH08503267A (fr)
BR (1) BR9307443A (fr)
CA (1) CA2149332A1 (fr)
FI (1) FI925159A0 (fr)
WO (1) WO1994011568A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995008021A1 (fr) * 1993-09-15 1995-03-23 Kamyr, Inc. Phase eop pour la blanchiement sans chlorure
US5571377A (en) * 1993-06-08 1996-11-05 Kvaerner Pulping Technologies Ab Process for peroxide bleaching of chemical pulp in a pressurized bleach vessel
US6547923B1 (en) 1989-05-10 2003-04-15 Andritz Oy Process for bleaching medium consistency pulp with ozone using a pressurized fluidizing mixer
RU2634586C1 (ru) * 2016-08-01 2017-10-31 федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" Способ отбелки лиственной сульфатной целлюлозы

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002266272A (ja) * 2001-03-12 2002-09-18 Nippon Paper Industries Co Ltd セルロース質繊維材料パルプの漂白方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087553A1 (fr) * 1982-02-27 1983-09-07 Degussa Aktiengesellschaft Procédé de fabrication de pâtes cellulosiques semi-blanchies
EP0429767A1 (fr) * 1989-11-17 1991-06-05 Air Products And Chemicals, Inc. Délignification de fibres contenant de la lignocellulose
EP0433138A1 (fr) * 1989-12-11 1991-06-19 La Cellulose Du Pin Procédé de blanchiment de pâtes cellulosiques chimiques
EP0512590A1 (fr) * 1991-04-30 1992-11-11 Eka Nobel Ab Procédé de blanchiment de matériaux contenant de la lignocellulose

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087553A1 (fr) * 1982-02-27 1983-09-07 Degussa Aktiengesellschaft Procédé de fabrication de pâtes cellulosiques semi-blanchies
EP0429767A1 (fr) * 1989-11-17 1991-06-05 Air Products And Chemicals, Inc. Délignification de fibres contenant de la lignocellulose
EP0433138A1 (fr) * 1989-12-11 1991-06-19 La Cellulose Du Pin Procédé de blanchiment de pâtes cellulosiques chimiques
EP0512590A1 (fr) * 1991-04-30 1992-11-11 Eka Nobel Ab Procédé de blanchiment de matériaux contenant de la lignocellulose

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6547923B1 (en) 1989-05-10 2003-04-15 Andritz Oy Process for bleaching medium consistency pulp with ozone using a pressurized fluidizing mixer
US5571377A (en) * 1993-06-08 1996-11-05 Kvaerner Pulping Technologies Ab Process for peroxide bleaching of chemical pulp in a pressurized bleach vessel
WO1995008021A1 (fr) * 1993-09-15 1995-03-23 Kamyr, Inc. Phase eop pour la blanchiement sans chlorure
RU2634586C1 (ru) * 2016-08-01 2017-10-31 федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" Способ отбелки лиственной сульфатной целлюлозы

Also Published As

Publication number Publication date
FI925159A0 (fi) 1992-11-13
CA2149332A1 (fr) 1994-05-26
JPH08503267A (ja) 1996-04-09
BR9307443A (pt) 1999-06-01
EP0669999A1 (fr) 1995-09-06

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