Air separation

Details Air separation Air separation

1996-10-09

1997-11-25

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, 62924, F25J 300

Patent

active

056899750

ABSTRACT:
A stream of precooled and purified air is introduced into a double rectification column comprising a higher pressure rectification column and a lower pressure rectification column and is separated therein into an oxygen-rich fraction and a nitrogen-rich fraction. A stream of argon-enriched oxygen vapor flows from an outlet of the lower pressure rectification column into a side column in which argon is separated therefrom. An oxygen-enriched liquid air stream is taken from an outlet at the bottom of the higher pressure rectification column. A vaporous oxygen-enriched air stream is introduced into the lower pressure rectification column through an inlet above the outlet. At least part of the oxygen-enriched liquid is separated in a further or intermediate pressure rectification column provided with a reboiler, thereby forming a vapor depleted of oxygen and a liquid air stream further enriched in oxygen. At least one stream of the further-enriched liquid is vaporised to form the oxygen-enriched vapor that is introduced into the lower pressure rectification column. A part of the oxygen-depleted vapor is condensed in a condenser and is taken as product or reintroduced into the lower pressure rectification column. The partial reboiling in the reboiler is effected by indirect heat exchange with a vapor stream withdrawn from an intermediate region of the side column. The condenser is cooled by a stream of liquid withdrawn from the further rectification column.

REFERENCES:
patent: 5341647 (1994-08-01), Koeberle et al.
patent: 5428962 (1995-07-01), Rieth
patent: 5471842 (1995-12-01), Mostello et al.

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