Method for brightening pulp with hydrosulfite solution generated from borohydride and bisulfite
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United States of America Patent
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Apr 18, 2006
Grant Date -
Jan 1, 2004
app pub date -
Jun 19, 2003
filing date -
Jun 28, 2002
priority date (Note) -
Expired
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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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