FI953343A - Process for pre-treatment of pulp to be bleached with peroxide - Google Patents
Process for pre-treatment of pulp to be bleached with peroxide Download PDFInfo
- Publication number
- FI953343A FI953343A FI953343A FI953343A FI953343A FI 953343 A FI953343 A FI 953343A FI 953343 A FI953343 A FI 953343A FI 953343 A FI953343 A FI 953343A FI 953343 A FI953343 A FI 953343A
- Authority
- FI
- Finland
- Prior art keywords
- pulp
- peroxide
- tower
- bleached
- acid
- Prior art date
Links
Abstract
The present invention relates to a process for pretreating pulp, which is to be bleached with peroxide, by treating it with acid and by chelating. In particular, the purpose of the invention is to render more efficient and at the same time simplify, the pretreatment which the peroxide bleaching requires. The process according to the invention is characterized in that the pulp is fed, at a consistency of 8-20%, into a pressurized acid tower 14 in which the pressure is 0-20 bar, preferably 1-10 bar and the temperature is 75-130 degree C, the pulp is treated in the acid tower 14 for 20-240 minutes, in order to decrease the kappa number and improve the bleachability, at a pH of 2-6, preferably at 3-4, the pulp is conveyed from the acid tower 14 to the chelating tower 24, the pulp is treated with complexing agent for at least 10-60 minutes at a pH of 4-9, preferably at 5-6, and the pulp is washed and/or pressed. <IMAGE>
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002211223A CA2211223C (en) | 1995-02-17 | 1996-02-16 | Method of pretreating pulp to be bleached with peroxide |
EP96902301A EP0858526A1 (en) | 1995-02-17 | 1996-02-16 | Method of pretreating pulp to be bleached with peroxide |
US08/875,424 US6736934B1 (en) | 1995-02-17 | 1996-02-16 | Method of pretreating pulp in an acid tower prior to bleaching with peroxide |
PCT/FI1996/000090 WO1996025552A1 (en) | 1995-02-17 | 1996-02-16 | Method of pretreating pulp to be bleached with peroxide |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI950749A FI103817B1 (en) | 1995-02-17 | 1995-02-17 | Process for pretreating pulp which is to be bleached with peroxide |
FI950749 | 1995-02-17 | ||
SE9502087 | 1995-06-07 | ||
SE9502087A SE516688E (en) | 1995-02-17 | 1995-06-07 | Treatment of pulp before peroxide bleaching with acid and complexing agents |
Publications (4)
Publication Number | Publication Date |
---|---|
FI953343A0 FI953343A0 (en) | 1995-07-06 |
FI953343A true FI953343A (en) | 1996-08-18 |
FI103819B FI103819B (en) | 1999-09-30 |
FI103819B1 FI103819B1 (en) | 1999-09-30 |
Family
ID=26159918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI953343A FI103819B1 (en) | 1995-02-17 | 1995-07-06 | Process for pretreating pulp which is to be bleached with peroxide |
Country Status (1)
Country | Link |
---|---|
FI (1) | FI103819B1 (en) |
-
1995
- 1995-07-06 FI FI953343A patent/FI103819B1/en active
Also Published As
Publication number | Publication date |
---|---|
FI103819B (en) | 1999-09-30 |
FI953343A0 (en) | 1995-07-06 |
FI103819B1 (en) | 1999-09-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
GB | Transfer or assigment of application |
Owner name: AHLSTROM MACHINERY OY |