Method for two-stage oxygen delignification of chemical pulp
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United States of America Patent
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Sep 24, 2002
Issued Date -
N/A
app pub date -
Jun 21, 2001
filing date -
Oct 23, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods for oxygen delignification of a pulp are disclosed, including initially delignifying the pulp at a delignification temperature of less than 90.degree. C., adding oxygen to the pulp so that the oxygen is present during the initial delignification step, and further delignifying the pulp at a delignification temperature of greater than 90.degree. C., the difference between the two delignification temperatures being less than about 20.degree. C., and the pressure being greater in the initial delignification step. The method also includes adding alkali solely to the initial delignification step in order to obtain high alkalinity therein.
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