Process for the cryogenic distillation of an air feed to produce

Details Process for the cryogenic distillation of an air feed to produce Process for the cryogenic distillation of an air feed to produce

1994-06-13

1995-08-22

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 39, F25J 302

Patent

active

054429250

ABSTRACT:
A process is set forth for the cryogenic distillation of an air feed to produce a low to medium purity oxygen product using a single distillation column system. The air feed is partially condensed into a crude liquid oxygen stream and a remaining nitrogen-enriched vapor stream by boiling the liquid phase at the bottom of the distillation column. The pressure of the crude liquid oxygen stream is reduced and the nitrogen-enriched vapor stream is subsequently condensed against it to provide reflux to the top of the distillation column. The low to medium purity oxygen product (oxygen concentration between 65% and 99%) is withdrawn from the bottom of the distillation column as liquid, vapor or a combination of both.

REFERENCES:
patent: 4382366 (1983-05-01), Gaumer
patent: 4566887 (1986-01-01), Openshaw
patent: 4707994 (1987-11-01), Shenoy et al.
patent: 5363657 (1994-11-01), Naumovitz

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