Air separation

Details Air separation Air separation

1995-06-09

1996-11-12

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, 62924, F25J 304

Patent

active

055728740

ABSTRACT:
Air is introduced through an inlet into a higher pressure rectification column. A stream of oxygen-enriched liquid is withdrawn through an outlet from the higher pressure rectification column. A part of this stream is introduced into a low pressure rectification column through an inlet. The stream is separated in the column low pressure rectification into oxygen and nitrogen. In addition, an argon-enriched vapor stream is withdrawn from the low pressure rectification column through an outlet, and is at least partially condensed in a reboiler-condenser which reboils oxygen separated in an argon column. One part of the resulting at least partially condensed argon-enriched oxygen stream is reduced in pressure by passage through a valve and is introduced through an inlet into an intermediate mass exchange region of the argon column in which it is separated into argon and oxygen. Another part of the at least partially condensed argon-enriched oxygen stream is returned by a pump to the low pressure rectification column.

REFERENCES:
patent: 4783208 (1988-11-01), Rathbone
patent: 5049174 (1991-09-01), Thorogood et al.
patent: 5100447 (1992-03-01), Krishnamurthy et al.
patent: 5305611 (1994-04-01), Howard
patent: 5396772 (1995-03-01), McKeigue et al.

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