Production of oxygen by air separation

Details Production of oxygen by air separation Production of oxygen by air separation

1980-08-15

1981-12-29

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 18, 62 29, 62 38, F25J 304

Patent

active

043080430

ABSTRACT:
Production of oxygen by compressing air to about 3 atmospheres, and passing the compressed air to a reversing heat exchanger in heat exchange relation with a nitrogen waste stream wherein a 3.degree. R temperature difference between the streams prevails at the cold end. Water vapor and CO.sub.2 are frozen out. Reversal of the flow stream causes sublimation or evaporation of the CO.sub.2 and water vapor. A portion of the air is withdrawn at an intermediate point in the exchanger and is further cooled in the lower portion of a non-adiabatic fractionating device wherein it is partly condensed by evaporating oxygen liquid product. The condensed air is then fed to the partial condensing zone of the fractionating device, whereby oxygen-rich liquid is condensed and overhead nitrogen is turbine expanded and passed in countercurrent heat exchange relation to the partial condensing zone. The oxygen-rich liquid, reduced in pressure to about 1 atmosphere, is fed to the partial evaoration zone of the fractionating device to remove nitrogen-rich vapor as overhead, and obtain oxygen of about 95% purity which is passed through a separate passage of the reversing exchanger.

REFERENCES:
patent: 1970299 (1934-08-01), Frankl
patent: 2817215 (1957-12-01), Sixsmith
patent: 2850880 (1958-09-01), Jakob
patent: 3257814 (1966-06-01), Carbonell
patent: 3535887 (1970-10-01), Hoffman

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