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PT100870A - Process for the bleaching of cellophane paste with OZONE - Google Patents

Process for the bleaching of cellophane paste with OZONE

Info

Publication number
PT100870A
PT100870A PT100870A PT10087092A PT100870A PT 100870 A PT100870 A PT 100870A PT 100870 A PT100870 A PT 100870A PT 10087092 A PT10087092 A PT 10087092A PT 100870 A PT100870 A PT 100870A
Authority
PT
Portugal
Prior art keywords
ozone
solution
bleaching
acidity
waste liquor
Prior art date
Application number
PT100870A
Other languages
Portuguese (pt)
Other versions
PT100870B (en
Inventor
Rolf Carl August Brannland
Sture Erik Olof Noreus
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
Publication of PT100870A publication Critical patent/PT100870A/en
Publication of PT100870B publication Critical patent/PT100870B/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.
PT100870A 1991-09-17 1992-09-16 Process for the bleaching of cellophane paste with OZONE PT100870B (en)

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 (2)

Publication Number Publication Date
PT100870A true PT100870A (en) 1994-01-31
PT100870B PT100870B (en) 1999-07-30

Family

ID=20383749

Family Applications (1)

Application Number Title Priority Date Filing Date
PT100870A PT100870B (en) 1991-09-17 1992-09-16 Process for the bleaching of cellophane paste with OZONE

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
SE9102693D0 (en) 1991-09-17
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
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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Legal Events

Date Code Title Description
BB1A Laying open of patent application

Effective date: 19930624

FG3A Patent granted, date of granting

Effective date: 19990416

MM3A Annulment or lapse

Free format text: LAPSE DUE TO NON-PAYMENT OF FEES

Effective date: 20011031