Method of air separation

Details Method of air separation Method of air separation

1991-05-17

1993-05-04

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 24, F25J 304

Patent

active

052070662

ABSTRACT:
A method includes separating at least 70% by volume of air in a double rectifier into oxygen, nitrogen gas and a gaseous argon fraction containing not more than 0.5% by volume of nitrogen. The latter is liquefied and fed into a rectifying column at a pressure exceeding a condensing pressure of the argon-nitrogen fraction by a value of from 0.01 to 0.06 MPa. A part of nitrogen gas is divided into two flows, a first of which is fed into the double rectifier and a second in an amount of not more than 40% by volume is sent into an evaporator of the rectifying column to deliver heat. The second flow of nitrogen may be changed by a part of the air being processed to be sent to said evaporator in an amount not in excess of 30% by volume.

REFERENCES:
patent: 4575388 (1986-03-01), Okada
patent: 4705548 (1987-11-01), Agrawal et al.
patent: 4715873 (1987-12-01), Auvil et al.
patent: 5019145 (1991-05-01), Rohde et al.
patent: 5034043 (1991-07-01), Rottmann

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