Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1995-06-07
1997-09-02
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 45, 162248, 162251, D21C 714
Patent
active
056627750
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make sure there is sufficient liquid to slurry the material in the feed system of a two vessel system, some liquid is withdrawn from the circulation conduits between the digester and impregnation vessel, cooled, and fed to the feed system.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phase digester, the level of liquid at the top of the digester is more precisely controlled by circulating some of the withdrawn liquid from a circulatory loop of the digester to the level tank associated with the feed system.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: 3303088 (1967-02-01), Gessner
patent: 4071399 (1978-01-01), Prough
patent: 4690731 (1987-09-01), Hartler et al.
patent: 5302247 (1994-04-01), Richardsen et al.
Brian Greenwood, "Continuous Digester", Apr. 1991.
Kemisk Massatillverkning, May 1992; Markaryd, pp. 2, 35, 43.
Chasse R. Fred
Laakso Richard O.
Marcoccia Bruno S.
Prough J. Robert
Ahlstrom Machinery Inc.
Czaja Donald E.
Nguyen Dean T.
LandOfFree
Continuous digester with dissolved solids handling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Continuous digester with dissolved solids handling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous digester with dissolved solids handling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-305134