CA2441841A1 - Peroxide bleaching of wood pulp - Google Patents

Peroxide bleaching of wood pulp Download PDF

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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
Application number
CA 2441841
Other languages
French (fr)
Other versions
CA2441841C (en
Inventor
Yonghao Ni
Zhiqing Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of New Brunswick
Original Assignee
University of New Brunswick
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US10/251,888 external-priority patent/US7001484B2/en
Application filed by University of New Brunswick filed Critical University of New Brunswick
Publication of CA2441841A1 publication Critical patent/CA2441841A1/en
Application granted granted Critical
Publication of CA2441841C publication Critical patent/CA2441841C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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.
CA 2441841 2002-09-23 2003-09-22 Peroxide bleaching of wood pulp Expired - Fee Related CA2441841C (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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Effective date: 20130924