Air separation

Details Air separation Air separation

1987-11-20

1988-12-13

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 24, F25J 304

Patent

active

047908661

ABSTRACT:
A method and apparatus for the separation of air is described. Air is separated in a double distillation column comprising higher and lower pressure columns, an argon-enriched fluid stream is withdrawn from the lower column and separated in a further distillation column provided with liquid argon reflux from a condenser to yield an argon product. Liquid nitrogen is withdrawn from the high pressure column and reboiled in the condenser to form a gaseous stream. At least part of the gaseous stream is warmed and withdrawn. The withdrawn stream may be taken as product or expanded in a turbine to provide refrigeration.

REFERENCES:
patent: 3729943 (1973-05-01), Petit
patent: 3751934 (1973-08-01), Frishbier
patent: 4575388 (1986-03-01), Okada
patent: 4615716 (1986-10-01), Cormier et al.

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