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SE9102693D0 - PROCEDURES FOR OZONE WHITING OF MASS - Google Patents

PROCEDURES FOR OZONE WHITING OF MASS

Info

Publication number
SE9102693D0
SE9102693D0 SE9102693A SE9102693A SE9102693D0 SE 9102693 D0 SE9102693 D0 SE 9102693D0 SE 9102693 A SE9102693 A SE 9102693A SE 9102693 A SE9102693 A SE 9102693A SE 9102693 D0 SE9102693 D0 SE 9102693D0
Authority
SE
Sweden
Prior art keywords
ozone
solution
acidity
waste liquor
cellulose pulp
Prior art date
Application number
SE9102693A
Other languages
Swedish (sv)
Other versions
SE500053C2 (en
SE9102693L (en
Inventor
R C A Braennland
Original Assignee
Mo Och Domsjoe 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 Mo Och Domsjoe Ab filed Critical Mo Och Domsjoe Ab
Priority to SE9102693A priority Critical patent/SE500053C2/en
Publication of SE9102693D0 publication Critical patent/SE9102693D0/en
Priority to PT100870A priority patent/PT100870B/en
Priority to DE69211351T priority patent/DE69211351T2/en
Priority to FI941238A priority patent/FI941238A7/en
Priority to ES92920388T priority patent/ES2089567T3/en
Priority to AU26631/92A priority patent/AU657003B2/en
Priority to AT92920388T priority patent/ATE138989T1/en
Priority to PCT/SE1992/000635 priority patent/WO1993006297A1/en
Priority to CA002116974A priority patent/CA2116974A1/en
Priority to EP92920388A priority patent/EP0605565B1/en
Publication of SE9102693L publication Critical patent/SE9102693L/en
Priority to NO940907A priority patent/NO303074B1/en
Publication of SE500053C2 publication Critical patent/SE500053C2/en
Priority to US09/112,325 priority patent/US6039837A/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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • 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

Landscapes

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

Abstract

When closing the process of manufacturing cellulose pulp of high brightness, i.e. including the recovery of essentially all waste liquor, there is an untenable enrichment of certain basic elements, such as sodium and sulphur. The present invention provides a partial solution to this problem and is concerned with a method in bleaching with ozone lignocellulosic material (cellulose pulp) which has been at least partially manufactured chemically, in the presence of water at a degree of acidity, expressed as pH, of 2-5. The method is characterized in that the acidity is maintained during the ozone bleaching process by adding a sulphuric acid solution or an acid sodium sulphate solution produced by electrolysis (or electrodialysis) of an essentially neutral sodium sulphate solution obtained by recycling chemicals in a system to which rest solution (waste liquor) from the ozone bleaching process is added.
SE9102693A 1991-09-17 1991-09-17 Ozone bleaching whereby the pulp is acidified with sulfuric acid produced by electrolysis SE500053C2 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
SE9102693A SE500053C2 (en) 1991-09-17 1991-09-17 Ozone bleaching whereby the pulp is acidified with sulfuric acid produced by electrolysis
EP92920388A EP0605565B1 (en) 1991-09-17 1992-09-16 A method in ozone bleaching of pulp
AT92920388T ATE138989T1 (en) 1991-09-17 1992-09-16 METHOD FOR BLEACHING PULP USING OZONE
DE69211351T DE69211351T2 (en) 1991-09-17 1992-09-16 METHOD FOR BLEACHING CELLULAR BY OZONE
FI941238A FI941238A7 (en) 1991-09-17 1992-09-16 Method in ozone bleaching of pulp
ES92920388T ES2089567T3 (en) 1991-09-17 1992-09-16 A METHOD FOR PASTA WHITENING WITH OZONE.
AU26631/92A AU657003B2 (en) 1991-09-17 1992-09-16 Ozone bleaching of pulp
PT100870A PT100870B (en) 1991-09-17 1992-09-16 Process for the bleaching of cellophane paste with OZONE
PCT/SE1992/000635 WO1993006297A1 (en) 1991-09-17 1992-09-16 A method in ozone bleaching of pulp
CA002116974A CA2116974A1 (en) 1991-09-17 1992-09-16 A method in ozone bleaching of pulp
NO940907A NO303074B1 (en) 1991-09-17 1994-03-14 Method of ozone bleaching of pulp
US09/112,325 US6039837A (en) 1991-09-17 1998-07-09 Method of bleaching pulp with ozone wherein the acidity is maintained with an acid solution prepared by electrolysis or electrodialysis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9102693A SE500053C2 (en) 1991-09-17 1991-09-17 Ozone bleaching whereby the pulp is acidified with sulfuric acid produced by electrolysis

Publications (3)

Publication Number Publication Date
SE9102693D0 true SE9102693D0 (en) 1991-09-17
SE9102693L SE9102693L (en) 1993-03-18
SE500053C2 SE500053C2 (en) 1994-03-28

Family

ID=20383749

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9102693A SE500053C2 (en) 1991-09-17 1991-09-17 Ozone bleaching whereby the pulp is acidified with sulfuric acid produced by electrolysis

Country Status (10)

Country Link
EP (1) EP0605565B1 (en)
AT (1) ATE138989T1 (en)
AU (1) AU657003B2 (en)
CA (1) CA2116974A1 (en)
DE (1) DE69211351T2 (en)
ES (1) ES2089567T3 (en)
FI (1) FI941238A7 (en)
PT (1) PT100870B (en)
SE (1) SE500053C2 (en)
WO (1) WO1993006297A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9704298L (en) * 1997-11-24 1999-05-25 Kvaerner Pulping Tech Procedure for bleaching cellulose in a closed system using Caro's acid
KR101815677B1 (en) * 2011-07-26 2018-01-30 롯데정밀화학 주식회사 Method for removing the chromaticity of cellulose and its derivatives
DE102013100997A1 (en) 2013-01-31 2014-07-31 Thyssenkrupp Resource Technologies Gmbh 1; 2 Method and plant for grinding lumpy starting material
CN115490372A (en) * 2021-06-17 2022-12-20 中国石油化工股份有限公司 Method and system for treating black liquor produced by pulping waste cotton

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503990B1 (en) * 1969-02-19 1975-02-13
NO144711C (en) * 1978-04-04 1981-10-21 Myrens Verksted As PROCEDURE FOR BLACKING OXYGEN-EQUIVALIZED CELLULOSE-containing OZONE

Also Published As

Publication number Publication date
ES2089567T3 (en) 1996-10-01
AU2663192A (en) 1993-04-27
FI941238L (en) 1994-03-16
FI941238A0 (en) 1994-03-16
SE500053C2 (en) 1994-03-28
SE9102693L (en) 1993-03-18
FI941238A7 (en) 1994-03-16
EP0605565B1 (en) 1996-06-05
WO1993006297A1 (en) 1993-04-01
PT100870A (en) 1994-01-31
DE69211351T2 (en) 1997-01-23
CA2116974A1 (en) 1993-04-01
DE69211351D1 (en) 1996-07-11
AU657003B2 (en) 1995-02-23
PT100870B (en) 1999-07-30
ATE138989T1 (en) 1996-06-15
EP0605565A1 (en) 1994-07-13

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