System for the oxygen delignification of pulp consisting of lignocellulose-containing material
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United States of America Patent
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Oct 26, 2004
Grant Date -
N/A
app pub date -
May 19, 2003
filing date -
Jul 6, 1999
priority date (Note) -
Expired
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Abstract
The system is for the oxygen delignification, in at least two reaction stages, of pulp that consists of lignocellulose-containing material having a mean concentration of 8%-18% pulp consistency. The oxygen delignification takes place in a first reaction stage that has a substantially constant low pressure during the whole delignification process. The second delignification stage has a substantially higher pressure and temperature and a longer dwell time. Readily delignifiable constituents in the pulp may react without the pulp being negatively affected so that the delignification process provides a very high degree of selectivity and an improved yield.
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