Method for delignification of cellulose with oxygen
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United States of America Patent
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May 30, 1989
Issued Date -
N/A
app pub date -
Jul 22, 1987
filing date -
Jun 27, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for delignifying chemical pulp by means of oxygen, in which an aqueous slurry of chemical pulp is formed, then mixed with a caustic agent, followed by contact with a delignifying fluid. Water is drained off the slurry without reduction of pressure and while maintaining temperature following which the resulting slurry is maintained under these temperature and pressure conditions for a discrete period of time. The thus-obtained treated slurry is then washed.
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