Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1995-10-19
1997-08-19
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 45, 162243, 162251, D21C 714
Patent
active
056584288
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.
REFERENCES:
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patent: 5302247 (1994-04-01), Richardson et al.
patent: 5522958 (1996-06-01), Li
Backlund, E.A., "Extended delignification of softwood kraft pulp in a continuous digester," Tappi Journal, vol. 67, No. 11, pp. 62-65, Nov. 1984.
Andtbacka, Stig, "Hur ombyggs kontinuerliga kokar for att mojliggora forlangd kokning?," Foredrag Pa SPCI, Oct. 1985.
Bjorkman, Annika, Letter dated Apr. 24, 1995 re Kamyr, Inc. Patent Application PCT/US94/03614 (WO 94/23120).
PCT International Search Report, Kvaerner Pulping Technologies AB, Nat. Appln. No. 9501572-3, filing date of Apr. 28, 1995.
Czaja Donald E.
Kananen Ronald P.
Kvaerner Pulping Technologies AB
Nguyen Dean T.
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