Process for activating cellulose pulp with NO and/or NO.sub.2 and oxygen in the presence of nitric acid and then delignifying bleaching the activated cellulose pulp
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United States of America Patent
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-
Jan 30, 1990
Grant Date -
N/A
app pub date -
Mar 24, 1982
filing date -
Sep 21, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is provided for activating cellulose pulp using NO and/or NO.sub.2 plus oxygen gas in the presence of nitric acid, added in an amount within the range from about 0.1 to about 1.0 gmole per kg of water accompanying the cellulose pulp at a temperature within the range from about 40.degree. to about 120.degree. C. for a time at an activating temperature of 40.degree. to 50.degree. C. of from 15 to 180 minutes, at from 50.degree. to 90.degree. C. of from 5 to 120 minutes, and at higher temperatures of from 1 to 10 minutes, followed by washing, and delignifying bleaching in an alkaline medium with or without oxygen gas and/or peroxide.
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