Air separation

Details Air separation Air separation

1995-11-16

1997-09-16

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62924, F25J 300

Patent

active

056668228

ABSTRACT:
Air is raised in pressure by a compressor and pre-purified by removal of impurities, particularly H.sub.2 O vapor and CO.sub.2, in an adsorption unit. The resulting air is cooled in a heat exchanger, and is subjected to a first rectification in a rectification column in which the air is separated into a nitrogen-rich fraction and an oxygen-rich fraction. A further oxygen fraction enriched in argon is subjected to a second rectification in which argon is separated from oxygen in a second rectification column. First and second argon products of different purity are withdrawn from the second rectification column through outlets thereof.

REFERENCES:
patent: 4670031 (1987-06-01), Erickson
patent: 5076823 (1991-12-01), Hansel et al.

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