Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-03-07
1977-01-25
Emery, Stephen J.
Chemistry: physical processes
Physical processes
Crystallization
62541, 62544, 62545, 23301, B01D 904
Patent
active
040048861
ABSTRACT:
A two stage continuous process and apparatus for crystallization of a solute or solvent from a solution comprising, first, passing the solution through a precrystallization zone with simultaneous cooling and/or rapid evaporation of the solvent resulting in the formation of small crystal nuclei, second, mixing the suspension from the precrystallization zone in a recrystallization zone with a suspension containing crystals of a much greater size than the crystal nuclei formed in the precrystallization zone wherein the crystal nuclei dissolve in the solution of the recrystallization zone and recrystallize on the larger crystals, the recrystallization step being carried out substantially adiabatic, and selectively recirculating part of the solution from the crystallization zone substantially crystal free to the precrystallization zone. Selective recirculation techniques provide a shortened residence time in the precrystallization zone without concurrently shortening the resistance time of the crystals in the crystallization zone.
REFERENCES:
patent: 2791333 (1957-05-01), McKay
patent: 2874199 (1959-02-01), Tarr
Huige Nicolaas J. J.
Thijssen Henricus A. C.
Emery Stephen J.
Stamicarbon B.V.
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