Process for delignification and bleaching of chemical wood pulps with hydrogen peroxide and a dicyandiamide activator
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United States of America Patent
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Apr 15, 1997
Grant Date -
N/A
app pub date -
Oct 31, 1994
filing date -
Oct 31, 1994
priority date (Note) -
Expired
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Abstract
A process of delignifying and bleaching a chemical wood pulp with hydrogen peroxide and dicyandiamide as an activator provides a higher degree of delignification and brightness of the pulp and overcomes problems of fiber degradation. The process comprises adding hydrogen peroxide and dicyandiamide as a bleaching activator to a chemical wood pulp slurry under alkaline conditions.
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