Process for continuous cooking of pulp
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United States of America Patent
Stats
-
Mar 2, 2004
Grant Date -
Jun 27, 2002
app pub date -
Sep 28, 2001
filing date -
Nov 3, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester (1) for production of chemically dissolved pulp. Fiber material and cooking liquor are introduced at the top of the digester and pulp is discharged from the bottom of the digester (1), via a line (8) in which the pulp is maintained at substantially the same pressure level, to a pressurized wash (7). 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. 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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