Distillative freezing process for separating volatile mixtures a

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

1978-08-02

1980-08-26

Yudkoff, Norman

Refrigeration

Processes

Fractionally solidifying a constituent and separating the same

62532, B01D 904

Patent

active

042188938

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 conducted to completely eliminate the liquid phase and bring the mixture into the two phase solid-vapor region. Then, the solid phase in 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: 2738658 (1920-03-01), Bronson
patent: 2777299 (1957-01-01), Skaperdas
patent: 3193395 (1965-07-01), Tabler et al.
patent: 3298796 (1967-01-01), Van Damme-VanWheele et al.
patent: 3690116 (1972-09-01), Cheng et al.
patent: 3859069 (1975-01-01), Seliber

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