Air separation

Details Air separation Air separation

1995-07-20

1996-11-26

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62924, F25J 300

Patent

active

055773940

ABSTRACT:
Cooled and purified air is introduced into a higher pressure rectifier in at least partly vaporous state and is separated therein into oxygen-enriched liquid air and nitrogen. One part of the nitrogen so separated is condensed in a reboiler-condenser and another part in a reboiler-condenser. Some of the condensate is used as reflux in the high pressure rectifier, and the rest of the condensate as reflux in a lower pressure rectifier. Oxygen-enriched liquid air is taken from the bottom of the higher pressure rectifier and is separated into oxygen and nitrogen in the lower pressure rectifier. A liquid argon-enriched oxygen stream is withdrawn from the lower pressure rectifier through an outlet and is separated into argon and oxygen fractions in a further rectifier. The further rectifier is reboiled by the reboiler-condenser.

REFERENCES:
patent: 4533375 (1985-08-01), Erickson
patent: 4575388 (1986-03-01), Okada
patent: 4702757 (1987-10-01), Kleinberg
patent: 4883516 (1989-11-01), Layland et al.
patent: 5305611 (1994-04-01), Howard

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