Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Reexamination Certificate
2006-02-21
2006-02-21
Alvo, Steve (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
C162S078000, C162S082000, C162S083000, C162S084000, C162S086000
Reexamination Certificate
active
07001484
ABSTRACT:
A 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.
REFERENCES:
patent: 2872280 (1959-02-01), Kindron
patent: 2920011 (1960-01-01), Eilers, Jr.
patent: 3023140 (1962-02-01), Textor
patent: 4029543 (1977-06-01), Lindahl
patent: 4311553 (1982-01-01), Akerlund et al.
patent: 4599138 (1986-07-01), Lindahl
patent: 4731161 (1988-03-01), Ehrhardt
patent: 4812206 (1989-03-01), Devic et al.
patent: 4849053 (1989-07-01), Gentile, Jr. et al.
patent: 4915785 (1990-04-01), Siminoski et al.
patent: 4938842 (1990-07-01), Whiting et al.
patent: 5002635 (1991-03-01), Gentile, Jr. et al.
patent: 5118389 (1992-06-01), Dubelsten et al.
patent: 606930 (1991-02-01), None
patent: 686115 (1964-05-01), None
patent: 820190 (1969-08-01), None
patent: 1262805 (1989-11-01), None
patent: 1274655 (1990-10-01), None
patent: 2041388 (1991-10-01), None
patent: 1294655 (1992-01-01), None
patent: 2057231 (1992-07-01), None
patent: 2099881 (1992-07-01), None
patent: 1310797 (1992-12-01), None
patent: 2070556 (1992-12-01), None
patent: 2099827 (1994-01-01), None
patent: 2189796 (1995-11-01), None
patent: 2017807 (1995-12-01), None
patent: 52-063402 (1977-05-01), None
patent: 1735463 (1992-05-01), None
Presley, J.R., et al., “Pulp Bleaching: Principles and Practice,” Edited by C.W. Dence and D.W. Reeve, pp. 480-481.
Ni, Y., et al., “Improving Peroxide Bleacing of Mechanical Pulps by An Enhanced Chelation Process,” Proceedings, PAPTAC Annual Meeting, Montreal, 1999, pp. 1-5.
Li Zhiqing
Ni Yonghao
Alvo Steve
Morgan & Lewis & Bockius, LLP
University of New Brunswick
LandOfFree
Peroxide bleaching of wood pulp using stabilizers and sodium... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Peroxide bleaching of wood pulp using stabilizers and sodium..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Peroxide bleaching of wood pulp using stabilizers and sodium... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3655715