Optimized intermediate height reflux for multipressure air disti

Details Optimized intermediate height reflux for multipressure air disti Optimized intermediate height reflux for multipressure air disti

1988-02-02

1989-04-04

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

62 31, 62 34, 62 38, F25J 304

Patent

active

048173940

ABSTRACT:
The invention discloses process and apparatus for separating high purity oxygen and crude argon from air by fractional distillation. The improvement, which applies to both dual pressure and triple pressure configurations, entails maximizing the distillation efficiency of both the HP rectifier (2 of FIG. 1) and the LP N.sub.2 rectifier (1a and 1b) by feeding precisely correct quantities of liquid air reflux to each via respective valves (6) and (8). In order to efficiently produce the required amount of liquid air, liquid oxygen at least 0.2 ATA above LP column pressure is evaporated by two air condensers: a total condenser (22) and a partial condenser (23).

REFERENCES:
patent: 4137056 (1979-01-01), Golouke
patent: 4605427 (1986-01-01), Erickson
patent: 4670031 (1987-06-01), Erickson
patent: 4737177 (1988-04-01), Erickson

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