Method for brightening pulp with hydrosulfite solution...

Details Method for brightening pulp with hydrosulfite solution... Method for brightening pulp with hydrosulfite solution...

2006-04-18

2006-04-18

Griffin, Steven P. (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

C162S024000, C162S083000, C162S090000

Reexamination Certificate

active

07029554

ABSTRACT:
A method for brightening pulp at a pH from 4.5 to 9. The method comprises the steps of: (a) combining an alkali metal borohydride, an alkali metal hydroxide, an alkali metal bisulfite and phosphoric acid to form a reducing solution; and (b) adding the reducing solution to a pulp slurry in an amount from 0.1% to 4% of hydrosulfite based on dry pulp fiber.

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