Chemistry: physical processes – Physical processes – Crystallization
Patent
1974-05-24
1976-11-02
Hart, Charles N.
Chemistry: physical processes
Physical processes
Crystallization
232705R, 196 1452, 210219, B01D 1104
Patent
active
039894673
ABSTRACT:
Two liquids of different density and which are mutually insoluble are temporarily contacted with each other by flowing them countercurrently through a series of contactor units which each includes a mixing sump, a retention channel, and a settling tank. The two liquids are mixed with a pumping type impeller in a mixing sump connected by a retention channel to a settling tank where the mixed liquids separate into upper and lower layers, which are separately removed and fed to the respective sumps of the next succeeding units. The retention channel is relatively long and narrow to provide the required interaction time between the two liquids in the mixture, and still prevent any substantial separation of the two liquids within the channel. The retention channel is also relatively shallow so the sump, channel, and settling tank bottoms are at substantially the same level. The settling tank, which has a much larger area than the sump and channel combined, can be at a low-cost ground level location, with little or no excavation being required for the sump or channel. There is relatively little difference in elevation between the sump inlet and settling tank outlet to minimize the pumping head required of the impeller, thereby avoiding overmixing of the two liquids and incomplete separation in the settling tank.
REFERENCES:
patent: 2081852 (1937-05-01), Darby et al.
patent: 2405158 (1946-08-01), Mensing
patent: 3239315 (1966-03-01), De Smet
patent: 3489526 (1970-01-01), El-Roy et al.
patent: 3544079 (1970-12-01), Dressler
Cintins Ivars
Hart Charles N.
Holmes & Narver, Inc.
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