Method for impregnation in a single-vessel hydraulic digester
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United States of America Patent
Stats
-
Aug 19, 1997
Grant Date -
N/A
app pub date -
Oct 19, 1995
filing date -
Oct 19, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a method for continuous cooking of kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips being conveyed from a high-pressure feeder (2) in a transfer line (2A, 4A) to a first end (3) of the digester (1), the chips being impregnated, in a liquid containing black liquor, in a concurrent impregnation zone (5), the chips being cooked in a cooking zone (6) subsequent to the impregnation zone, hot black liquor (7) being extracted from at least one extraction screen section (8), and cooked pulp being discharged (9) at the other end of the digester. The chips are, when they leave the high-pressure feeder (2), included in a first liquid, which first liquid is in the main separated from the chips in a liquid exchanger (4) installed in the transfer line (2A, 4A) and is replaced by a second liquid which contains black liquor.
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Patent Citation Ranking
- 3 Citation Count
- D21C Class
- 2.04 % this patent is cited more than
- 28 Age