ZA93317B - Bleaching of chemical pulp - Google Patents

Bleaching of chemical pulp

Info

Publication number
ZA93317B
ZA93317B ZA93317A ZA93317A ZA93317B ZA 93317 B ZA93317 B ZA 93317B ZA 93317 A ZA93317 A ZA 93317A ZA 93317 A ZA93317 A ZA 93317A ZA 93317 B ZA93317 B ZA 93317B
Authority
ZA
South Africa
Prior art keywords
bleaching
pulp
thereafter
consistency
complexing agent
Prior art date
Application number
ZA93317A
Inventor
Lars-Aake Lindstroem
Lars Sjoedin
Solveig Norden
Maarten Dahl
Original Assignee
Sunds Defibrator Ind 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
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=ZA93317(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Publication of ZA93317B publication Critical patent/ZA93317B/en

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

Landscapes

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

Abstract

A method of bleaching sulphate pulp without using chlorine-containing bleaching agents. The sulphate pulp is oxygen delignified and can possibly also be ozone delignified to a kappa number below 9.5. Thereafter a pretreatment with complexing agent is carried out for 1-60 minutes, at which the pulp consistency is 1-15 %, the temperature 70-110 DEG C and pH 5-7. The pulp thus pretreated is washed and dewatered to a consistency of 18-40 %. Thereafter peroxide bleaching in alkaline environment takes place in the presence of silicate or an organic complexing agent of the type phosphonic or carboxylic acid.
ZA93317A 1992-01-21 1993-01-18 Bleaching of chemical pulp ZA93317B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9200152A SE469842C (en) 1992-01-21 1992-01-21 Bleaching of chemical pulp with peroxide

Publications (1)

Publication Number Publication Date
ZA93317B true ZA93317B (en) 1993-08-19

Family

ID=20385065

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA93317A ZA93317B (en) 1992-01-21 1993-01-18 Bleaching of chemical pulp

Country Status (14)

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

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004674A3 (en) * 1991-03-11 1993-01-12 Interox Internat Sa Method of laundering of chemical pulp and application of the method of laundering pulp kraft.
BE1006056A3 (en) * 1992-07-06 1994-05-03 Solvay Interox Method of laundering of chemical pulp.
SE9301960L (en) * 1993-06-08 1994-07-25 Kvaerner Pulping Tech Bleaching of chemical pulp with peroxide at overpressure
SE501253C2 (en) * 1993-06-08 1994-12-19 Kvaerner Pulping Tech Chlorine-free bleaching of chemical pulp
EP0720676A4 (en) * 1993-09-02 1998-03-04 Union Camp Patent Holding Improved method for bleaching lignocellulosic pulp
BE1007757A3 (en) * 1993-11-10 1995-10-17 Solvay Interox Method of laundering of chemical pulp.
FR2719854B1 (en) * 1994-05-11 1996-06-21 Atochem Elf Sa Process for the preparation of delignified and bleached chemical paper pulps.
SE514697C2 (en) * 1994-08-31 2001-04-02 Valmet Fibertech Ab Elimination of metal ions in pulp bleaching

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
ATE97179T1 (en) * 1989-06-06 1993-11-15 Eka Nobel Ab PROCESS FOR BLEACHING LIGNOCELLULOSE CONTAINING PULP.
FI93866B (en) * 1990-02-09 1995-02-28 Sunds Defibrator Rauma Oy Method for preparing sulphate pulp

Also Published As

Publication number Publication date
DE69309893T2 (en) 1997-11-06
AU3412593A (en) 1993-08-03
FI943431A (en) 1994-07-20
SE9200152D0 (en) 1992-01-21
EP0621915B1 (en) 1997-04-16
ES2102008T3 (en) 1997-07-16
AU653467B2 (en) 1994-09-29
BR9305761A (en) 1997-01-28
NO942718D0 (en) 1994-07-20
SE469842C (en) 1996-01-15
NO942718L (en) 1994-07-20
SE469842B (en) 1993-09-27
WO1993014262A1 (en) 1993-07-22
EP0621915A1 (en) 1994-11-02
CA2124088A1 (en) 1993-07-22
DE69309893D1 (en) 1997-05-22
SE9200152L (en) 1993-07-22
ATE151826T1 (en) 1997-05-15
JPH07503042A (en) 1995-03-30
NZ246713A (en) 1995-04-27
FI943431A0 (en) 1994-07-20

Similar Documents

Publication Publication Date Title
FR2457339B1 (en)
PL309191A1 (en) Method delignifying a lignocellulose containing pulp
ZA93317B (en) Bleaching of chemical pulp
ATE48290T1 (en) PROCESSES FOR DELIGNIFICATION AND BLEACHING OF PULP.
SE9400277L (en) oxygen / ozone / peracetic acid delignification and bleaching of cellulose pulp
NZ237866A (en) Process for delignifying and bleaching cellulose pulp wherein there is a reduced formation and discharge of halogenated organic compounds in the waste liquor; pulp treated with a trace metal complexing agent and then with a peroxide agent
WO1994023118A3 (en) Bleaching recycled pulp with a reductive-oxidative sequence
FI90888B (en) Method for bleaching cellulose pulp
FI934036A (en) Method for bleaching pulp with chlorine-free chemicals
MY132667A (en) Process for the bleaching of pulp
SE9700992L (en) Procedure for bleaching of pulp
SE8003911L (en) PROCEDURE FOR CELLULOSAMAS Oxygen Bleaching
ATE498735T1 (en) OXIDIZED WHITE LYE IN A DELIGNIFICATION PROCESS
ES2038954A6 (en) Bleaching of paper pulp
DE3461941D1 (en) Hypochlorite treatment of chemical paper pulps
AU6986294A (en) Method of bleaching pulp without using chlorine chemicals
SE9702583L (en) Process for mass production
SE9303066L (en) Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step
SE9502365L (en) Bleaching of lignocellulosic fibrous material
SE9203366D0 (en) PROCEDURES FOR DELIGNIFICATION AND / OR WHITE CELLULOSAMASSA
EP0607448A4 (en) Process for producing thiourea dioxide and bleaching of papermaking pulp with thiourea dioxide produced thereby.
SE8904247D0 (en) PROCEDURE FOR BLACKING OF CHEMICAL CELLULOSAMASSA