Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1997-05-27
1998-12-15
Silverman, Stanley S.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 43, 162248, D21C 714
Patent
active
058491511
ABSTRACT:
Digester systems for producing paper pulp from comminuted cellulosic fibrous material take into account the level of dissolved organic materials (DOM), such as lignin, hemi-cellulose, and cellulose, maintaining the DOM level at about 100 g/l throughout the cook (particularly kraft cook). In order to make sure there is sufficient liquid to slurry the material in the feed system of a two vessel system, some liquid is withdrawn from the circulation conduits between the digester and impregnation vessel, cooled, and fed to the feed system. In a vapor phase digester, the level of liquid at the top of the digester is more precisely controlled by circulating some of the withdrawn liquid from a circulatory loop of the digester to the level tank associated with the feed system. An in-line drainer may be provided in the feed system between a make-up liquor pump and a liquid inlet conduit leading to the top of an impregnation vessel. Within the digester, a set of extraction/dilution screens is provided specifically positioned and spaced from each other, and with respect to a reintroduction conduit opening, so that mixing of different DOM concentration liquids is minimized.
REFERENCES:
patent: 3425898 (1969-02-01), Laakso
patent: 4071399 (1978-01-01), Prough
patent: 4670098 (1987-06-01), Thorsell et al.
Greenwood, Brian, "Continuous Digester", Kamyn, Apr. 1991.
McKenna et al, "Displacement Impregnation in a continuous digester", TAPPI, vol. 60, No. 5, May 1977.
Chasse R. Fred
Laakso Richard O.
Marcoccia Bruno S.
Prough J. Robert
Ahlstrom Machinery Inc.
Nguyen Dean T.
Silverman Stanley S.
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