CA2441841A1 - Peroxide bleaching of wood pulp - Google Patents
Peroxide bleaching of wood pulp Download PDFInfo
- Publication number
- CA2441841A1 CA2441841A1 CA 2441841 CA2441841A CA2441841A1 CA 2441841 A1 CA2441841 A1 CA 2441841A1 CA 2441841 CA2441841 CA 2441841 CA 2441841 A CA2441841 A CA 2441841A CA 2441841 A1 CA2441841 A1 CA 2441841A1
- Authority
- CA
- Canada
- Prior art keywords
- slurry
- peroxide bleaching
- wood pulp
- stabilizer
- bleaching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- Paper (AREA)
Abstract
There is provided a new and useful process for peroxide bleaching of mechanical or high yield pulp, the process comprising adding to a pulp slurry at least one stabilizer for stabilizing low valency states of transition metal ions in the slurry; subsequently adding caustic soda to said slurry simultaneously with or subsequent to adding said at least one stabilizer; adding hydrogen peroxide to the slurry at a preselected point; and subjecting the slurry to preselected conditions to complete the bleaching process.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/251,888 | 2002-09-23 | ||
US10/251,888 US7001484B2 (en) | 2000-05-04 | 2002-09-23 | Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2441841A1 true CA2441841A1 (en) | 2004-03-23 |
CA2441841C CA2441841C (en) | 2007-08-07 |
Family
ID=32228701
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2441841 Expired - Fee Related CA2441841C (en) | 2002-09-23 | 2003-09-22 | Peroxide bleaching of wood pulp |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2441841C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005080673A2 (en) * | 2004-02-25 | 2005-09-01 | Kemira Oyj | A process for the treatment of fibre material and new composition |
WO2005108673A1 (en) | 2004-05-12 | 2005-11-17 | Kemira Oyj | New composition and process for the treatment of fibre material |
-
2003
- 2003-09-22 CA CA 2441841 patent/CA2441841C/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005080673A2 (en) * | 2004-02-25 | 2005-09-01 | Kemira Oyj | A process for the treatment of fibre material and new composition |
WO2005080673A3 (en) * | 2004-02-25 | 2005-11-10 | Kemira Oyj | A process for the treatment of fibre material and new composition |
US7988821B2 (en) | 2004-02-25 | 2011-08-02 | Kemira Oyj | Process for the treatment of fibre material and new composition |
WO2005108673A1 (en) | 2004-05-12 | 2005-11-17 | Kemira Oyj | New composition and process for the treatment of fibre material |
US8048264B2 (en) | 2004-05-12 | 2011-11-01 | Kemira Oyj | Composition and process for the treatment of fibre material |
Also Published As
Publication number | Publication date |
---|---|
CA2441841C (en) | 2007-08-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20130924 |