Process for the continuous digestion of cellulosic fiber material
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United States of America Patent
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-
Jan 14, 1992
Grant Date -
N/A
app pub date -
Oct 12, 1989
filing date -
Dec 20, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the continuous digestion of cellulosic fiber material is described wherein the material is impregnated with liquid in a closed system comprising a concurrent flow zone and a countercurrent flow zone, the liquid in the concurrent flow zone including black liquor and possibly white liquor and the liquid in the countercurrent flow zone including white liquor. Liquid is withdrawn from the impregnation system at a point located between the concurrent flow zone and the countercurrent flow zone. Besides white liquor a predetermined amount of black liquor is added to the countercurrent flow zone in order to obtain a high liquid to wood ratio in the inlet of the digester.
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