Air separation

Details Air separation Air separation

1995-05-22

1996-08-20

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, 62924, F25J 302

Patent

active

055467660

ABSTRACT:
Air is compressed in a compressor, purified in a purification unit, cooled by passage through a main heat exchanger and separated in a double rectification column comprising a higher pressure rectification column and a lower pressure rectification column. A stream of argon-enriched oxygen vapour is withdrawn from the lower pressure rectification column through an outlet and an argon product is separated from it in an argon rectification column provided with an argon condenser. Argon is condensed in the condenser by indirect heat exchange with a second stream of air at a pressure between the operating pressures of the columns. The second air stream is partially condensed and passed into a phase separator. A stream of liquid phase is withdrawn from the phase separator, is passed through a throttling valve and the condenser, in sequence. Further cooling for the condenser is thus provided.

REFERENCES:
patent: 4715873 (1987-12-01), Auvil et al.
patent: 5195324 (1993-03-01), Cheung
patent: 5305611 (1994-04-01), Howard
patent: 5440884 (1995-08-01), Bonaquist et al.

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