Method for brightening pulp with hydrosulfite solutions

Details Method for brightening pulp with hydrosulfite solutions Method for brightening pulp with hydrosulfite solutions

D - Textiles, Paper

21

H

D21H 17/64 (2006.01) D21C 9/10 (2006.01) D21H 21/00 (2006.01)

Patent

CA 2432459

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 bisulfate 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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