Peroxide bleaching of wood pulp using stabilizers and sodium...

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical

Reexamination Certificate

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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.

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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.

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