FR2373638A1 - Multistage bleaching of lignocellulose pulp - using chlorine di:oxide under acid conditions in first stage, increasing reaction rate and effectiveness - Google Patents

Multistage bleaching of lignocellulose pulp - using chlorine di:oxide under acid conditions in first stage, increasing reaction rate and effectiveness

Info

Publication number
FR2373638A1
FR2373638A1 FR7736977A FR7736977A FR2373638A1 FR 2373638 A1 FR2373638 A1 FR 2373638A1 FR 7736977 A FR7736977 A FR 7736977A FR 7736977 A FR7736977 A FR 7736977A FR 2373638 A1 FR2373638 A1 FR 2373638A1
Authority
FR
France
Prior art keywords
stage
pulp
reaction rate
bleaching
chlorine
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.)
Withdrawn
Application number
FR7736977A
Other languages
French (fr)
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.)
SCA Development AB
Original Assignee
SCA Development 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
Application filed by SCA Development AB filed Critical SCA Development AB
Publication of FR2373638A1 publication Critical patent/FR2373638A1/en
Withdrawn legal-status Critical Current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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

In the first stage, the pH of the bleaching soln. is adjusted to 3.5, pref. 3.0, esp. 2.5 and the ClO2 charge in the first stage is kept below that which is normal for chlorination at 0.6-1.0, esp. 0.7-0.95 times the Cl no. w.r.t. the %age of active Cl in the pulp. The pH can pref. be adjusted with residual acid from ClO2 mfr. or with waste liquor from the acid bleaching stages, e.g., the first stage. The pulp concn. is 8-16% and the temp. 30-50 degrees C. The pH value not only increases the reaction rate considerably but also makes the reaction more effective, possibly by contributing to the dissoln. of lignin. Birch sulphate pulp was bleached by the D-E-H-D-E-D process. In the first stage, bleaching was carried out at a pulp concn. of 4% for 40 mins. at 30 degrees C, using 21.6 (25.5) kg. ClO2/t. and pH 3.1 (5.0). The ISO brightness of the pulp was 886. (86.0)% and the viscosity 960 (780)dm3/kg. The chemical cost was 89:40 (107:85) Swedish kroner/t.
FR7736977A 1976-12-09 1977-12-08 Multistage bleaching of lignocellulose pulp - using chlorine di:oxide under acid conditions in first stage, increasing reaction rate and effectiveness Withdrawn FR2373638A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7613827A SE7613827L (en) 1976-12-09 1976-12-09 WAY TO TREAT LIGNOCELLULOSIS-CONTAINING MATERIAL.

Publications (1)

Publication Number Publication Date
FR2373638A1 true FR2373638A1 (en) 1978-07-07

Family

ID=20329703

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7736977A Withdrawn FR2373638A1 (en) 1976-12-09 1977-12-08 Multistage bleaching of lignocellulose pulp - using chlorine di:oxide under acid conditions in first stage, increasing reaction rate and effectiveness

Country Status (6)

Country Link
JP (1) JPS5374105A (en)
DE (1) DE2754949C3 (en)
FI (1) FI68683B (en)
FR (1) FR2373638A1 (en)
NO (1) NO152259C (en)
SE (1) SE7613827L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61289193A (en) * 1985-06-14 1986-12-19 神崎製紙株式会社 Bleaching of pulp
SE9000340L (en) * 1990-01-31 1991-08-01 Eka Nobel Ab PROCEDURES FOR BLACKING OF LIGNOCELLULOSALLY MATERIAL

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5318602B2 (en) * 1973-07-20 1978-06-16

Also Published As

Publication number Publication date
DE2754949A1 (en) 1978-06-22
NO152259C (en) 1985-08-28
DE2754949C3 (en) 1979-05-31
FI773710A (en) 1978-06-10
NO774181L (en) 1978-06-12
SE7613827L (en) 1978-06-10
DE2754949B2 (en) 1978-10-05
JPS5374105A (en) 1978-07-01
FI68683B (en) 1985-06-28
NO152259B (en) 1985-05-20

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Legal Events

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