Distillative freezing process for separating volatile mixtures

Details Distillative freezing process for separating volatile mixtures Distillative freezing process for separating volatile mixtures

1981-08-25

1983-04-05

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62532, 23294S, F25J 300

Patent

active

043789846

ABSTRACT:
The distillative freezing process disclosed is useful in separating a mixture containing at least two volatile components, denoted respectively as A-component and B-component, by simultaneously vaporizing the two components from the mixture under a sufficiently reduced pressure to simultaneously crystallize B-component. The vapor mixture obtained is brought to a condensed state either by a simple condensation operation or a condensation-desublimation operation without being substantially pressurized. The process may be continued to completely eliminate the liquid phase and bring the mixture into the two phase solid-vapor region. Then, the solid phase is no longer contaminated by the adhering liquid phase and gives a high purity B-component on melting. The process is particularly useful in separating mixtures containing close boiling components, such as styrene-ethyl benzene mixtures, p-xylene-m-xylene mixtures and ethylene-ethane mixtures. The process can therefore be used in producing high purity monomers for the plastic industries and high purity chemicals for other industries.

REFERENCES:
patent: 1534130 (1925-04-01), McAfee et al.
patent: 1901486 (1933-03-01), Wurster et al.
patent: 2572933 (1951-10-01), Houvener
patent: 2715323 (1955-08-01), Johnson et al.
patent: 2737784 (1956-03-01), Becker et al.
patent: 2812645 (1957-11-01), Locklair et al.
patent: 3042501 (1962-07-01), Noblitt
patent: 3930800 (1976-01-01), Schoener et al.

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