Parallel contact distillative freezing process for separating vo

Details Parallel contact distillative freezing process for separating vo Parallel contact distillative freezing process for separating vo

1981-10-01

1984-02-28

Sever, Frank

Refrigeration

Processes

Fractionally solidifying a constituent and separating the same

34 5, B01D 904

Patent

active

044335580

ABSTRACT:
The parallel contact distillative freezing process is an improved distillative freezing process. The distillative freezing process is used 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 crystalline B-component. The vapor mixture obtained is brought to a condensed state by lowering its temperature a few degrees without substantially pressurizing it. 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 parallel contact distillative freezing process is conducted within an elongated processing zone, wherein feed is introduced at one end and the purified B-solid and the low pressure vapor are both discharged at the other end. The vapor, solid and liquid are all transferred in the same direction; the vapor is allowed to interact with the liquid constantly as the vaporization and solidification take place.

REFERENCES:
patent: 2507632 (1950-05-01), Hickman
patent: 3024117 (1962-03-01), Barlow
patent: 3385074 (1968-05-01), Aronson
patent: 4218893 (1980-08-01), Cheng et al.

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