WO1993014262A1 - Blanchiment de pate chimique - Google Patents

Blanchiment de pate chimique Download PDF

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Publication number
WO1993014262A1
WO1993014262A1 PCT/SE1993/000012 SE9300012W WO9314262A1 WO 1993014262 A1 WO1993014262 A1 WO 1993014262A1 SE 9300012 W SE9300012 W SE 9300012W WO 9314262 A1 WO9314262 A1 WO 9314262A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
bleaching
complexing agent
consistency
peroxide
Prior art date
Application number
PCT/SE1993/000012
Other languages
English (en)
Inventor
Lars-Åke LINDSTRÖM
Lars SJÖDIN
Solveig Norden
Mårten DAHL
Original Assignee
Sunds Defibrator Industries Aktiebolag
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20385065&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1993014262(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sunds Defibrator Industries Aktiebolag filed Critical Sunds Defibrator Industries Aktiebolag
Priority to AU34125/93A priority Critical patent/AU653467B2/en
Priority to BR9305761A priority patent/BR9305761A/pt
Priority to EP93902618A priority patent/EP0621915B1/fr
Priority to JP5512379A priority patent/JPH07503042A/ja
Priority to DE69309893T priority patent/DE69309893T2/de
Publication of WO1993014262A1 publication Critical patent/WO1993014262A1/fr
Priority to NO942718A priority patent/NO942718L/no
Priority to FI943431A priority patent/FI943431A0/fi

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
    • D21C9/147—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
    • D21C9/1057—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
    • 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

  • This invention relates to the bleaching of sulphate pulp without using bleaching agents containing chlorine.
  • the technique of bleaching chemical pulps is now developing rapidly, because the bleaching chemicals heretofore mainly used, CI 2 , ClO 2, and hypochl-orite, are feared to give rise to products being a risk for the environment and health.
  • Extended digestion with maintained pulp quality can be achieved by impregnating the chips with black liquor in the initial phase of the cook, as described in Finnish patent application 90 0663.
  • This method renders it possible to digest pulp down to a kappa number of about 10 and obtain strength properties equal to or better than with pulp digested to conventional level, kappa number 25-30. Combined with oxygen delignification, kappa numbers as low as 5-6 can be obtained for.further bleaching.
  • the present invention implies, that fully bleached pulp with a brightness above 83% ISO can be made without the use of chlorine-containing bleaching agents.
  • the pulp shall have a kappa number below 9.5. This can be achieved by conventional or extended digestion followed by O 2 -delignification, alternatively by conventional or extended digestion followed by O 2 - and O 3 -delignification.
  • the bleaching is initiated by a pretreatment step with complexing agent followed by treatment with hydroperoxide in alkaline environment in the presence of silicate or an organic complexing agent of the type phosphonic or carboxylic acid.
  • the pulp digested and delignified with oxygen and possibly ozone according to above shall have a kappa number below 9.5. This can be achieved by known methods of digestion and delignification.
  • the pulp shall thereafter be pretreated with complexing agent, for example EDTA or DTPA, at a pulp consistency of 1-15% for 1-60 minutes, preferably 5-30 minutes.
  • the temperature shall be 70-100°C, preferably 80-100°C, and the pH-value 5-7.
  • the pulp thus pretreated is washed and dewatered to a consistency of 18-4.0%, preferably 20-30%.
  • the pH-value is increased to alkaline level, and hydroperoxide is added together with silicate, for example sodium silicate, alternatively together with an organic complexing agent of the type phosphonic or carboxylic acid.
  • the dwell time of the pulp in this hydroperoxide step shall be 1/2 - 5 hours, preferably 1-4 hours, and the temperature 70-100°C, preferably 80-100°C.
  • the silicate charge shall be 2-30 kg/ton pulp, preferably 5-15 kg/ton pulp, expressed as SiO 2 .
  • the charge of the organic complexing agent shall be 0.5-5 kg/ton pulp.
  • Fig. 1 is a diagram, in which the brightness of the pulp is plotted as a function of the pulp consistency at the peroxide bleaching,partly at conventional peroxide bleaching and partly at bleaching according to the invention.
  • the starting pulp was oxygen-delignified coniferous wood sulphate pulp with kappa number 6.5 (10.5 after digestion).
  • Curve 1 showg. conventional peroxide bleaching, with a consumption of H 2 O 2 of 20 kg/ton pulp.
  • Curve 2 and, respectively, 3 refer to bleaching according to the invention with silicate addition and a consumption of H 2 O 2 of 20 and, respectively, 30 kg/ton pulp. It appears from the diagram how the brightness, after bleaching according to the invention and, respectively, after conventional bleaching, depends on the pulp consistency. At about 12% pulp consistency, the brightness obtained is" equal in both cases, but at increased pulp consistency in the peroxide step an increased brightness is obtained according to the invention, while conventional peroxide bleaching results in a deteriorated bright- ness.
  • a coniferous wood sulphate pulp with kappa number 13.3 (digested of Scandinavian fir/pine according to Finnish patent application 90 0663), oxygen delignified to kappa number 8.3 and ozone bleached in acid environment to kappa number 3.2, brightness 61% ISO, intrinsic viscosity 582 dm 3 /kg, was bleached according to the invention.

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

Abstract

L'invention se rapporte à un procédé pour le blanchiment de pâte au sulfate sans utiliser d'agents de blanchiment contenant du chlore. La pâte au sulfate est soumise à une délignification à l'oxygène et elle peut éventuellement aussi être soumise à une délignification à l'ozone jusqu'à présenter un indice kappa inférieur à 9,5. On effectue ensuite un prétraitement avec un agent complexant pendant 1 à 16 minutes, pendant lequel la consistance de la pâte se situe entre 1 et 15 %, la température entre 70 et 110 °C et le pH entre 5 et 7. La pâte ainsi prétraitée est ensuite lavée et égouttée jusqu'à présenter une consistance de 18 à 40 %. Un blanchiment au peroxyde en milieu alcalin a lieu ensuite en présence du silicate ou d'un agent complexant organique du type acide phosphonique ou carboxylique.
PCT/SE1993/000012 1992-01-21 1993-01-12 Blanchiment de pate chimique WO1993014262A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU34125/93A AU653467B2 (en) 1992-01-21 1993-01-12 Bleaching of sulphate pulp
BR9305761A BR9305761A (pt) 1992-01-21 1993-01-12 Processo de alvejamento de polpa de sulfato
EP93902618A EP0621915B1 (fr) 1992-01-21 1993-01-12 Blanchiment de pate chimique
JP5512379A JPH07503042A (ja) 1992-01-21 1993-01-12 化学パルプの漂白
DE69309893T DE69309893T2 (de) 1992-01-21 1993-01-12 Bleichen von chemischem zellstoff
NO942718A NO942718L (no) 1992-01-21 1994-07-20 Bleking av kjemisk masse
FI943431A FI943431A0 (fi) 1992-01-21 1994-07-20 Kemiallisen massan valkaisu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9200152A SE469842C (sv) 1992-01-21 1992-01-21 Blekning av kemisk massa med peroxid
SE9200152-8 1992-01-21

Publications (1)

Publication Number Publication Date
WO1993014262A1 true WO1993014262A1 (fr) 1993-07-22

Family

ID=20385065

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1993/000012 WO1993014262A1 (fr) 1992-01-21 1993-01-12 Blanchiment de pate chimique

Country Status (14)

Country Link
EP (1) EP0621915B1 (fr)
JP (1) JPH07503042A (fr)
AT (1) ATE151826T1 (fr)
AU (1) AU653467B2 (fr)
BR (1) BR9305761A (fr)
CA (1) CA2124088A1 (fr)
DE (1) DE69309893T2 (fr)
ES (1) ES2102008T3 (fr)
FI (1) FI943431A0 (fr)
NO (1) NO942718L (fr)
NZ (1) NZ246713A (fr)
SE (1) SE469842C (fr)
WO (1) WO1993014262A1 (fr)
ZA (1) ZA93317B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994029512A1 (fr) * 1993-06-08 1994-12-22 Kvaerner Pulping Technologies Ab Procede de blanchiment de la pate de cellulose sans produits chimiques chlores
WO1996006976A1 (fr) * 1994-08-31 1996-03-07 Sunds Defibrator Industries Ab Blanchiment de la pate a papier
EP0720676A1 (fr) * 1993-09-02 1996-07-10 Union Camp Patent Holding, Inc. Procede ameliore de blanchiment de pate lignocellulosique
EP0578304B1 (fr) * 1992-07-06 1996-09-18 SOLVAY INTEROX (Société Anonyme) Procédé pour le blanchiment d'une pâte à papier chimique
US5571377A (en) * 1993-06-08 1996-11-05 Kvaerner Pulping Technologies Ab Process for peroxide bleaching of chemical pulp in a pressurized bleach vessel
EP0759105B1 (fr) * 1994-05-11 1998-12-02 Elf Atochem S.A. Procede de preparation de pates a papier chimiques delignifiees et blanchies
EP0728238B1 (fr) * 1993-11-10 1999-01-13 SOLVAY INTEROX (Société Anonyme) Procede pour le blanchiment d'une pate a papier chimique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004674A3 (fr) * 1991-03-11 1993-01-12 Interox Internat Sa Procede pour le blanchiment d'une pate a papier chimique et application de ce procede au blanchiment d'une pate kraft.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262836A1 (fr) * 1986-09-15 1988-04-06 The Dow Chemical Company Procédé de blanchiment des pâtes cellulosiques utilisant le peroxyde d'hydrogène
US4938842A (en) * 1986-08-20 1990-07-03 Abitibi-Price Inc. High consistency peroxide bleaching
EP0402335A2 (fr) * 1989-06-06 1990-12-12 Eka Nobel Ab Procédé de blanchiment de pâtes contenant de la lignocellulose
WO1991012368A1 (fr) * 1990-02-09 1991-08-22 Sunds Defibrator Rauma Oy Procede de preparation de pate a papier kraft

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938842A (en) * 1986-08-20 1990-07-03 Abitibi-Price Inc. High consistency peroxide bleaching
EP0262836A1 (fr) * 1986-09-15 1988-04-06 The Dow Chemical Company Procédé de blanchiment des pâtes cellulosiques utilisant le peroxyde d'hydrogène
EP0402335A2 (fr) * 1989-06-06 1990-12-12 Eka Nobel Ab Procédé de blanchiment de pâtes contenant de la lignocellulose
WO1991012368A1 (fr) * 1990-02-09 1991-08-22 Sunds Defibrator Rauma Oy Procede de preparation de pate a papier kraft

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Journal of Wood Chemistry and Technology, Volume 2, No. 3, 1982, GOERAN GELLERSTEDT et al., "Chemical Aspects of Hydrogen Peroxide Bleaching", page 231 - page 250, esp. page 233, line 29 - line 33. *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578304B1 (fr) * 1992-07-06 1996-09-18 SOLVAY INTEROX (Société Anonyme) Procédé pour le blanchiment d'une pâte à papier chimique
WO1994029512A1 (fr) * 1993-06-08 1994-12-22 Kvaerner Pulping Technologies Ab Procede de blanchiment de la pate de cellulose sans produits chimiques chlores
US5571377A (en) * 1993-06-08 1996-11-05 Kvaerner Pulping Technologies Ab Process for peroxide bleaching of chemical pulp in a pressurized bleach vessel
EP0720676A1 (fr) * 1993-09-02 1996-07-10 Union Camp Patent Holding, Inc. Procede ameliore de blanchiment de pate lignocellulosique
EP0720676A4 (fr) * 1993-09-02 1998-03-04 Union Camp Patent Holding Procede ameliore de blanchiment de pate lignocellulosique
EP0728238B1 (fr) * 1993-11-10 1999-01-13 SOLVAY INTEROX (Société Anonyme) Procede pour le blanchiment d'une pate a papier chimique
EP0759105B1 (fr) * 1994-05-11 1998-12-02 Elf Atochem S.A. Procede de preparation de pates a papier chimiques delignifiees et blanchies
WO1996006976A1 (fr) * 1994-08-31 1996-03-07 Sunds Defibrator Industries Ab Blanchiment de la pate a papier
CN1065578C (zh) * 1994-08-31 2001-05-09 瑞典商顺智公司 浆料的漂白
US6540872B1 (en) 1994-08-31 2003-04-01 Velmet Fibertech Aktiebolag Process for chlorine dioxide bleaching using a chelating agent without an intermediate wash

Also Published As

Publication number Publication date
DE69309893T2 (de) 1997-11-06
AU3412593A (en) 1993-08-03
FI943431A (fi) 1994-07-20
SE9200152D0 (sv) 1992-01-21
EP0621915B1 (fr) 1997-04-16
ES2102008T3 (es) 1997-07-16
AU653467B2 (en) 1994-09-29
BR9305761A (pt) 1997-01-28
NO942718D0 (no) 1994-07-20
SE469842C (sv) 1996-01-15
NO942718L (no) 1994-07-20
SE469842B (sv) 1993-09-27
EP0621915A1 (fr) 1994-11-02
CA2124088A1 (fr) 1993-07-22
ZA93317B (en) 1993-08-19
DE69309893D1 (de) 1997-05-22
SE9200152L (sv) 1993-07-22
ATE151826T1 (de) 1997-05-15
JPH07503042A (ja) 1995-03-30
NZ246713A (en) 1995-04-27
FI943431A0 (fi) 1994-07-20

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