Process for the delignification and bleaching of chemical paper pulps with hydrogen peroxide and at least one polymer
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United States of America Patent
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Apr 29, 2003
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N/A
app pub date -
Apr 11, 1997
filing date -
Apr 12, 1996
priority date (Note) -
Expired
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Abstract
A process for the delignification and bleaching of chemical paper pulps comprising one or more stage(s) of treatment with hydrogen peroxide, at a temperature greater than 100.degree. C. and under high pressure, in the presence of a polymer and of a compound A chosen from potassium hydroxide, sodium hydroxide and alkali metal or alkaline-earth metal carbonates.
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