Process for continuous cooking of pulp
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United States of America Patent
Stats
-
Aug 12, 2003
Grant Date -
Jun 27, 2002
app pub date -
Sep 28, 2001
filing date -
Nov 3, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Fiber material and cooking liquor are introduced at the top of the digester and pulp is discharged from the bottom of the digester, via a line in which the pulp is maintained at substantially the same pressure level, to a pressurized wash. More than 50% of the used cooking liquor (black liquor) which is extracted from the system in total is extracted from the wash filtrate of the pressurized wash. At the same time a small portion of the wash filtrate is also to be recirculated to the bottom of the digester as dilution liquid. The pressurized wash is regulated so that a high temperature is maintained in the wash filtrate. The extraction is regulated so that a net co-current flow is established at the bottom of the digester.
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