Air separation

Details Air separation Air separation

1987-11-20

1988-11-08

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 23, 62 38, F25J 304

Patent

active

047832088

ABSTRACT:
An improvement is provided in a process of separating air in a conventional double rectification column to produce oxygen and argon. In accordance with the invention, refrigeration is transfered to the oxygen-rich liquid conventionally formed in the higher pressure column from oxygen-poor liquid formed by condensing the oxygen-poor vapor formed in the higher pressure column. In addition, a portion of the oxygen-poor liquid is vaporized and either withdrawn as product or expanded in a turbine to provide refrigeration in the process.

REFERENCES:
patent: 3596471 (1971-08-01), Streich
patent: 3729943 (1973-05-01), Petit
patent: 4533375 (1985-08-01), Erickson
patent: 4617036 (1986-10-01), Suchdeo et al.
patent: 4715873 (1987-12-01), Auvil et al.

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