Process for recovering nitrogen under pressure in air separation

Details Process for recovering nitrogen under pressure in air separation Process for recovering nitrogen under pressure in air separation

1980-09-17

1982-04-20

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 29, F25J 304

Patent

active

043257194

ABSTRACT:
In an air separation apparatus for separating air by cryogenic process, thereby recovering oxygen and nitrogen, pressure of nitrogen gas withdrawn from an upper column of duplex type rectification tower is increased through an ejector utilizing liquid nitrogen to be introduced into the upper column as a reflux from lower column of duplex type rectification tower, and then the nitrogen gas is separated from the liquid nitrogen, and recovered under a desired pressure, while supplying the liquid nitrogen to the upper column. Product nitrogen is recovered under high pressure.

REFERENCES:
patent: 2673456 (1954-03-01), Scharmann
patent: 3267684 (1966-08-01), Jakob
patent: 4091633 (1978-05-01), Linde

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