SE9303551L - Ways to treat chemical pulp without the use of chlorine-containing chemicals - Google Patents
Ways to treat chemical pulp without the use of chlorine-containing chemicalsInfo
- Publication number
- SE9303551L SE9303551L SE9303551A SE9303551A SE9303551L SE 9303551 L SE9303551 L SE 9303551L SE 9303551 A SE9303551 A SE 9303551A SE 9303551 A SE9303551 A SE 9303551A SE 9303551 L SE9303551 L SE 9303551L
- Authority
- SE
- Sweden
- Prior art keywords
- stage
- chlorine
- ways
- bleaching
- chemical 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
- 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
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
- D21C9/04—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in diffusers ; Washing of pulp of fluid consistency without substantially thickening
-
- 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
-
- 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
- D21C9/1026—Other features in bleaching processes
- D21C9/1042—Use of chelating agents
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Cooked chemical paper pulp is bleached by treating in (i) a delignifying P stage using a peroxide charge of 2-8 kilos/BDMT (ii) a delignifying acid stage and (iii) a bleaching P stage using at least 3 kilos/BDMT of peroxide and above the amts. used in stage (i). Bleaching apparatus for the process comprising bleaching towers (7,17 and 19) and a washing sequence contg. a displacement wash section and a consistency adjusting wash unit between the towers is also claimed.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9303551A SE512491C2 (en) | 1993-10-28 | 1993-10-28 | Chlorine free bleaching of chemical paper pulps |
US08/218,647 US6605181B1 (en) | 1993-10-01 | 1994-03-28 | Peroxide bleach sequence including an acidic bleach stage and including a wash stage |
PCT/SE1994/000889 WO1995009945A1 (en) | 1993-10-01 | 1994-09-27 | Method of treating chemical paper pulp without using chlorine-containing chemicals |
AU78260/94A AU7826094A (en) | 1993-10-01 | 1994-09-27 | Method of treating chemical paper pulp without using chlorine-containing chemicals |
BR9407668A BR9407668A (en) | 1993-10-01 | 1994-09-27 | Process for bleaching chemical pulp or dissolving wood pulp that has been cooked and device for implementing the process |
FI961419A FI961419A0 (en) | 1993-10-01 | 1996-03-29 | A method of treating chemical pulp without the use of chlorine-containing chemicals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9303551A SE512491C2 (en) | 1993-10-28 | 1993-10-28 | Chlorine free bleaching of chemical paper pulps |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9303551D0 SE9303551D0 (en) | 1993-10-28 |
SE9303551L true SE9303551L (en) | 1995-04-29 |
SE512491C2 SE512491C2 (en) | 2000-03-27 |
Family
ID=20391564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9303551A SE512491C2 (en) | 1993-10-01 | 1993-10-28 | Chlorine free bleaching of chemical paper pulps |
Country Status (1)
Country | Link |
---|---|
SE (1) | SE512491C2 (en) |
-
1993
- 1993-10-28 SE SE9303551A patent/SE512491C2/en unknown
Also Published As
Publication number | Publication date |
---|---|
SE9303551D0 (en) | 1993-10-28 |
SE512491C2 (en) | 2000-03-27 |
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