Thermodynamically improved system for producing gaseous oxygen a

Details Thermodynamically improved system for producing gaseous oxygen a Thermodynamically improved system for producing gaseous oxygen a

1974-07-10

1976-03-30

Bascomb, Jr., Wilbur L.

Refrigeration

Processes

Circulating external gas

62 30, 60 38, F25J 500

Patent

active

039472590

ABSTRACT:
A process for producing gaseous oxygen and gaseous nitrogen by the low-temperature rectification of air in a double rectification column having a low-pressure section and a high-pressure section, comprising warming a process stream in a cold section of a reversible heat exchange zone against entering air and thereupon engine-expanding resultant warmed process stream, the improvement wherein a portion is branched off from the warmed process stream prior to its expansion, which portion is liquefield in a condenser-evaporator of the double rectifying column, is subcooled, and is then expanded into the low-pressure section (7) of the double rectifying column (8).

REFERENCES:
patent: 3066494 (1962-12-01), Potts
patent: R19267 (1934-08-01), VanNuys

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