Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1998-05-06
2000-05-16
Nguyen, Dean T.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 45, 162243, 162251, D21C 324, D21C 714
Patent
active
060632380
ABSTRACT:
The present invention relates to a digester and a method for continuously cooking kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips (2) being fed in at a first end (3) of the digester (1), white liquor (4) being added at at least one position at or near the said first end (3), the chips being impregnated in a cocurrent impregnation zone (5), the chips being cooked in a cooking zone (6) downstream of the impregnation zone, hot black liquor (7) being extracted from at least one extraction strainer section (8), and cooked pulp being discharged (9) at the other end of the digester, and hot black liquor (7) being added (11), (12) to the said impregnation zone (5), and the extract (13) from the first strainer section (14), which is arranged downstream of the position of addition (11a) of the said hot black liquor (7), being largely removed from the digester.
REFERENCES:
patent: 3303088 (1967-02-01), Gessner
patent: 3427218 (1969-02-01), Richter
patent: 5658428 (1997-08-01), Oulie
Bergqvist Anders
Engstrom Johan
Kvaerner Pulping AB
Melcher Jeffrey S.
Nguyen Dean T.
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