Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1993-04-05
1995-05-09
Jones, W. Gary
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 17, 162 19, 162 39, 162242, 162249, D21C 710, D21C 714
Patent
active
054136776
ABSTRACT:
Chemical pulp is produced from hardwood chips in a simplified manner utilizing a continuous digester. An inverted top separator is provided in the circulatory loop between the high pressure feeder and the top of the continuous digester for thermally isolating circulations on either side of the inverted top separator. Relatively cool liquor circulates between the inverted top separator and high pressure feeder, at a temperature such that it will not flash into steam in a high pressure feeder, while in the circulatory loop from the high pressure feeder to the digester the chips are in cooking liquor at cooking temperature. Since hardwood chips require less cooking than softwood chips, a single heating source for heating the liquor to cooking temperature is provided, external of the digester, and a conventional cooking circulation loop within the digester is not required.
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patent: 4668340 (1987-05-01), Sherman
C. A. Backlund, "Extended Delignification . . . Cont. Digester", TAPPI Journal, Nov., 1984; pp. 62-65.
Rydholm, Sven "Continuous Pulping Processes", TAPPI, 1970, pp. 121-157.
Blom et al., "Development of the Alva Prehydrolysis Process", 1981 Pulping Conference, 409-416.
Kortelainen et al., "Experiences w/extended Delig. . . . ", Tappi Journal, Nov. 1985, pp. 70-74.
McDonald et al., "The Pulping of Wood", 2nd Edition, 1969, pp. 422-427.
Tappi Proceedings--1981 Pulping Conference--Development of the Alva Prehydrolysis Process--Part Two: Mill Scale Application Blom, Nevalainen & Arhippainen, pp. 409-416.
Kamyr AB Kraft Prehydrolysis drawing figure; Feb. 1, 1982.
Jones W. Gary
Kamyr Inc.
Nguyen Dean T.
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