SE9403174D0 - A method for the enzymatic treatment of chemical pulp before bleaching - Google Patents
A method for the enzymatic treatment of chemical pulp before bleachingInfo
- Publication number
- SE9403174D0 SE9403174D0 SE9403174A SE9403174A SE9403174D0 SE 9403174 D0 SE9403174 D0 SE 9403174D0 SE 9403174 A SE9403174 A SE 9403174A SE 9403174 A SE9403174 A SE 9403174A SE 9403174 D0 SE9403174 D0 SE 9403174D0
- Authority
- SE
- Sweden
- Prior art keywords
- pulp
- chemical pulp
- enzymatic treatment
- pulp before
- before bleaching
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- 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
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
This invention provides a method of increasing the degree of delignification of chemical pulp without decreasing the viscosity thereof. In this method, unbleached pulp or pulp which has been subjected to oxygen delignification is subjected to a pre-bleaching treatment, in which xylanase having an activity in the range of pH of not more than 4.5 is used, as the pulp is maintained under acidic conditions. This method enables the quantity of use of a medicine of a chlorine compound to be reduced while maintaining such a degree of whiteness of bleached pulp that permits commercial use, whereby the occurrence of an organic chlorine compound which is environmentally harmful can be minimized.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP009477U JPH0670208U (en) | 1993-01-22 | 1993-01-22 | coil |
JP21296693 | 1993-08-27 | ||
PCT/JP1994/000076 WO1994017237A1 (en) | 1993-01-22 | 1994-01-21 | Pre-bleaching treatment method using enzyme for chemical pulp |
Publications (2)
Publication Number | Publication Date |
---|---|
SE9403174D0 true SE9403174D0 (en) | 1994-09-21 |
SE9403174L SE9403174L (en) | 1994-11-16 |
Family
ID=26344222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9403174A SE9403174L (en) | 1993-01-22 | 1994-09-21 | Method for enzymatic treatment of chemical pulp before bleaching |
Country Status (4)
Country | Link |
---|---|
CA (1) | CA2130906A1 (en) |
FI (1) | FI944350A0 (en) |
SE (1) | SE9403174L (en) |
WO (1) | WO1994017237A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4920504B1 (en) * | 1969-06-07 | 1974-05-25 | ||
FR2604198B1 (en) * | 1986-09-22 | 1989-07-07 | Du Pin Cellulose | PROCESS FOR TREATING A PAPER PULP WITH AN ENZYMATIC SOLUTION. |
NO894623L (en) * | 1988-11-23 | 1990-05-25 | Sandoz Ag | BIOLOGICAL PROCEDURE FOR PULP WHITENING. |
US5179021A (en) * | 1989-02-10 | 1993-01-12 | Gil Inc. (Now Ici Canada Inc.) | Pulp bleaching process comprising oxygen delignification and xylanase enzyme treatment |
-
1994
- 1994-01-21 WO PCT/JP1994/000076 patent/WO1994017237A1/en active Application Filing
- 1994-01-21 CA CA 2130906 patent/CA2130906A1/en not_active Abandoned
- 1994-09-20 FI FI944350A patent/FI944350A0/en unknown
- 1994-09-21 SE SE9403174A patent/SE9403174L/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
SE9403174L (en) | 1994-11-16 |
FI944350A (en) | 1994-09-20 |
FI944350A0 (en) | 1994-09-20 |
CA2130906A1 (en) | 1994-08-04 |
WO1994017237A1 (en) | 1994-08-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NAV | Patent application has lapsed |
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