EP0621915A1 - Blanchiment de pate chimique. - Google Patents

Blanchiment de pate chimique.

Info

Publication number
EP0621915A1
EP0621915A1 EP93902618A EP93902618A EP0621915A1 EP 0621915 A1 EP0621915 A1 EP 0621915A1 EP 93902618 A EP93902618 A EP 93902618A EP 93902618 A EP93902618 A EP 93902618A EP 0621915 A1 EP0621915 A1 EP 0621915A1
Authority
EP
European Patent Office
Prior art keywords
pulp
bleaching
complexing agent
peroxide
consistency
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.)
Granted
Application number
EP93902618A
Other languages
German (de)
English (en)
Other versions
EP0621915B1 (fr
Inventor
Lars-Ake Lindstroem
Lars Sjoedin
Solveig Norden
Marten Dahl
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.)
Valmet AB
Original Assignee
Sunds Defibrator AB
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
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Application filed by Sunds Defibrator AB filed Critical Sunds Defibrator AB
Publication of EP0621915A1 publication Critical patent/EP0621915A1/fr
Application granted granted Critical
Publication of EP0621915B1 publication Critical patent/EP0621915B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21C9/147—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.

Landscapes

  • 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.
EP93902618A 1992-01-21 1993-01-12 Blanchiment de pate chimique Expired - Lifetime EP0621915B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9200152 1992-01-21
SE9200152A SE469842C (sv) 1992-01-21 1992-01-21 Blekning av kemisk massa med peroxid
PCT/SE1993/000012 WO1993014262A1 (fr) 1992-01-21 1993-01-12 Blanchiment de pate chimique

Publications (2)

Publication Number Publication Date
EP0621915A1 true EP0621915A1 (fr) 1994-11-02
EP0621915B1 EP0621915B1 (fr) 1997-04-16

Family

ID=20385065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93902618A Expired - Lifetime EP0621915B1 (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) FI943431L (fr)
NO (1) NO942718L (fr)
NZ (1) NZ246713A (fr)
SE (1) SE469842C (fr)
WO (1) WO1993014262A1 (fr)
ZA (1) ZA93317B (fr)

Families Citing this family (8)

* 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.
BE1006056A3 (fr) * 1992-07-06 1994-05-03 Solvay Interox Procede pour le blanchiment d'une pate a papier chimique.
SE500616C2 (sv) * 1993-06-08 1994-07-25 Kvaerner Pulping Tech Blekning av kemisk massa med peroxid vid övertryck
SE501253C2 (sv) * 1993-06-08 1994-12-19 Kvaerner Pulping Tech Klorfri blekning av kemisk pappersmassa
JPH09502229A (ja) * 1993-09-02 1997-03-04 ユニオン キャンプ パテント ホールディング インコーポレイテッド リグノセルロースパルプの改良漂白方法
BE1007757A3 (fr) * 1993-11-10 1995-10-17 Solvay Interox Procede pour le blanchiment d'une pate a papier chimique.
FR2719854B1 (fr) * 1994-05-11 1996-06-21 Atochem Elf Sa Procédé de préparation de pâtes à papier chimiques délignifiées et blanchies.
SE514697C2 (sv) * 1994-08-31 2001-04-02 Valmet Fibertech Ab Eliminering av metalljoner vid blekning av massa

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8620222D0 (en) * 1986-08-20 1986-10-01 Abitibi Price Inc Peroxide bleaching
US4732650A (en) * 1986-09-15 1988-03-22 The Dow Chemical Company Bleaching of cellulosic pulps using hydrogen peroxide
DE69004492T3 (de) * 1989-06-06 2001-11-15 Eka Nobel Ab, Bohus Verfahren zum Bleichen von Lignocellulose enthaltenden Zellstoffen.
FI93866B (fi) * 1990-02-09 1995-02-28 Sunds Defibrator Rauma Oy Menetelmä sulfaattimassan valmistamiseksi

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9314262A1 *

Also Published As

Publication number Publication date
ATE151826T1 (de) 1997-05-15
EP0621915B1 (fr) 1997-04-16
SE469842C (sv) 1996-01-15
SE9200152D0 (sv) 1992-01-21
BR9305761A (pt) 1997-01-28
JPH07503042A (ja) 1995-03-30
DE69309893D1 (de) 1997-05-22
SE9200152L (sv) 1993-07-22
AU653467B2 (en) 1994-09-29
NZ246713A (en) 1995-04-27
ES2102008T3 (es) 1997-07-16
DE69309893T2 (de) 1997-11-06
CA2124088A1 (fr) 1993-07-22
ZA93317B (en) 1993-08-19
SE469842B (sv) 1993-09-27
FI943431A7 (fi) 1994-07-20
FI943431A0 (fi) 1994-07-20
WO1993014262A1 (fr) 1993-07-22
FI943431L (fi) 1994-07-20
NO942718D0 (no) 1994-07-20
AU3412593A (en) 1993-08-03
NO942718L (no) 1994-07-20

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