Method for brightening virgin mechanical pulp
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United States of America Patent
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Jan 16, 2007
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app pub date -
Oct 31, 2003
filing date -
Nov 5, 2002
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Abstract
A method for brightening virgin mechanical pulp. The method comprises combining: (i) an aqueous solution comprising sodium borohydride and sodium hydroxide; and (ii) an aqueous solution comprising sodium bisulfite, in a chemical mixer and adding output of the chemical mixer to an aqueous slurry of virgin mechanical pulp. The ratio of (moles bisulfite-moles hydroxide)/moles borohydride is from 0 to 7.8.
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