ATE138989T1 - METHOD FOR BLEACHING PULP USING OZONE - Google Patents
METHOD FOR BLEACHING PULP USING OZONEInfo
- Publication number
- ATE138989T1 ATE138989T1 AT92920388T AT92920388T ATE138989T1 AT E138989 T1 ATE138989 T1 AT E138989T1 AT 92920388 T AT92920388 T AT 92920388T AT 92920388 T AT92920388 T AT 92920388T AT E138989 T1 ATE138989 T1 AT E138989T1
- Authority
- AT
- Austria
- Prior art keywords
- ozone
- solution
- acidity
- waste liquor
- cellulose pulp
- Prior art date
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.
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 (1)
Publication Number | Publication Date |
---|---|
ATE138989T1 true ATE138989T1 (en) | 1996-06-15 |
Family
ID=20383749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT92920388T ATE138989T1 (en) | 1991-09-17 | 1992-09-16 | METHOD FOR BLEACHING PULP USING 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) | FI941238A (en) |
PT (1) | PT100870B (en) |
SE (1) | SE500053C2 (en) |
WO (1) | WO1993006297A1 (en) |
Families Citing this family (4)
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)
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 |
-
1991
- 1991-09-17 SE SE9102693A patent/SE500053C2/en unknown
-
1992
- 1992-09-16 ES ES92920388T patent/ES2089567T3/en not_active Expired - Lifetime
- 1992-09-16 EP EP92920388A patent/EP0605565B1/en not_active Expired - Lifetime
- 1992-09-16 AT AT92920388T patent/ATE138989T1/en active
- 1992-09-16 PT PT100870A patent/PT100870B/en not_active IP Right Cessation
- 1992-09-16 WO PCT/SE1992/000635 patent/WO1993006297A1/en active IP Right Grant
- 1992-09-16 AU AU26631/92A patent/AU657003B2/en not_active Ceased
- 1992-09-16 DE DE69211351T patent/DE69211351T2/en not_active Expired - Fee Related
- 1992-09-16 CA CA002116974A patent/CA2116974A1/en not_active Abandoned
-
1994
- 1994-03-16 FI FI941238A patent/FI941238A/en unknown
Also Published As
Publication number | Publication date |
---|---|
AU657003B2 (en) | 1995-02-23 |
PT100870A (en) | 1994-01-31 |
SE500053C2 (en) | 1994-03-28 |
FI941238A0 (en) | 1994-03-16 |
EP0605565B1 (en) | 1996-06-05 |
EP0605565A1 (en) | 1994-07-13 |
DE69211351T2 (en) | 1997-01-23 |
ES2089567T3 (en) | 1996-10-01 |
SE9102693L (en) | 1993-03-18 |
FI941238A (en) | 1994-03-16 |
CA2116974A1 (en) | 1993-04-01 |
SE9102693D0 (en) | 1991-09-17 |
WO1993006297A1 (en) | 1993-04-01 |
DE69211351D1 (en) | 1996-07-11 |
AU2663192A (en) | 1993-04-27 |
PT100870B (en) | 1999-07-30 |
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