Process for separating crystallizable fractions from mixtures th

Details Process for separating crystallizable fractions from mixtures th Process for separating crystallizable fractions from mixtures th

1978-01-24

1978-12-12

Niebling, John

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260419, 208 35, 208 37, 208 38, 62533, 62534, 62535, C09F 510, C11B 300, C10G 4306

Patent

active

041295838

ABSTRACT:
In a continuous process for separating crystallizable organic components from mixtures thereof in solution, a feedstock of such components is mixed with at least one solvent therefor and the resulting feedstock mixture is continuously fed into a vessel in which a baffle defines a partially confined first zone and a partially confined second zone communicating with the first zone. At least one low-boiling point high-vapor pressure refrigerant is injected into the feedstock mixture in the first zone and evaporates and adiabatically expands therein to effect rapid cooling of the mixture to a selected low temperature and thereby form a slurry of microcrystals of components which are crystallizable down to the selected temperature. The resulting slurry is conducted to the second zone where it is contacted with warmer incoming feedstock mixtures to achieve an intermediate temperature at which crystals of lower melting point components melt and are redissolved while crystals of higher melting point components undergo crystal growth to form a slurry of larger crystals. The resulting slurry is withdrawn from the second zone and filtered to separate the crystals from the withdrawn slurry.

REFERENCES:
patent: 3443391 (1969-05-01), Storment et al.
patent: 3554896 (1971-12-01), Bozeman et al.
patent: 3658688 (1972-04-01), Biribaner

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