SE9403074L - Pulp bleaching process - Google Patents
Pulp bleaching processInfo
- Publication number
- SE9403074L SE9403074L SE9403074A SE9403074A SE9403074L SE 9403074 L SE9403074 L SE 9403074L SE 9403074 A SE9403074 A SE 9403074A SE 9403074 A SE9403074 A SE 9403074A SE 9403074 L SE9403074 L SE 9403074L
- Authority
- SE
- Sweden
- Prior art keywords
- pulp
- pulp bleaching
- prod
- iso
- brightness
- 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
- D21C9/10—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
- D21C9/147—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
- D21C9/1026—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
Pulp is (a) cooked (b) treated wit EDTA, DTPA and/or acidified to remove heavy metals (c) delignified in at least 2 oxygen stages with no wash between them (d) bleached with O2, O3, ClO2 and/or H2O2 to give a bleached pulp prod. with at least ISO 80 brightness. Pulp bleaching with Cl2 free cpds. Cl2 and O3 use can be avoided. Brightness of prod. can be increased to ISO 90 if needed by using an O3 stage in place of H2O2. Pollution is lowered.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI934056A FI98224B (en) | 1993-09-15 | 1993-09-15 | Method for bleaching of pulp |
Publications (4)
Publication Number | Publication Date |
---|---|
SE9403074D0 SE9403074D0 (en) | 1994-09-14 |
SE9403074L true SE9403074L (en) | 1995-03-16 |
SE516353C2 SE516353C2 (en) | 2001-12-17 |
SE516353E SE516353E (en) | 2003-06-04 |
Family
ID=8538599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9403074A SE516353E (en) | 1993-09-15 | 1994-09-14 | Pulp bleaching process |
Country Status (3)
Country | Link |
---|---|
CA (1) | CA2132056C (en) |
FI (1) | FI98224B (en) |
SE (1) | SE516353E (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6514380B1 (en) * | 1995-03-08 | 2003-02-04 | Andritz Oy | Treatment of chemical pulp |
WO1997036042A1 (en) | 1996-03-26 | 1997-10-02 | Sunds Defibrator Industries Ab | Oxygen delignification of pulp in two stages |
CN100417500C (en) | 1998-06-17 | 2008-09-10 | 尼勒纤维纸浆和纸公司 | Arundo donax pulp, paper product and flakeboard |
US20030029589A1 (en) * | 1998-06-17 | 2003-02-13 | Nile Fiber Pulp & Paper, Inc. | Total chlorine free bleaching of Arundo donax pulp |
FI117391B (en) | 2000-05-16 | 2006-09-29 | Andritz Oy | Method and apparatus for pulping |
-
1993
- 1993-09-15 FI FI934056A patent/FI98224B/en active
-
1994
- 1994-09-14 SE SE9403074A patent/SE516353E/en not_active IP Right Cessation
- 1994-09-14 CA CA002132056A patent/CA2132056C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
SE516353E (en) | 2003-06-04 |
SE9403074D0 (en) | 1994-09-14 |
CA2132056C (en) | 1998-11-24 |
CA2132056A1 (en) | 1995-03-16 |
FI98224B (en) | 1997-01-31 |
SE516353C2 (en) | 2001-12-17 |
FI934056A0 (en) | 1993-09-15 |
FI934056A (en) | 1995-03-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RPOP | Patent has been republished in amended form after opposition | ||
NUG | Patent has lapsed |