Air separation with intermediate pressure vaporization and expan

Details Air separation with intermediate pressure vaporization and expan Air separation with intermediate pressure vaporization and expan

1997-09-15

1999-09-28

Kilner, Christopher B.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62924, F25J 304

Patent

active

059569735

ABSTRACT:
A double column cryogenic air separation system is operated to increase boilup in the lower pressure column by vaporizing at an intermediate pressure a liquid stream containing at least 20 mole % oxygen, work expanding the stream, and introducing the resulting expanded stream into the lower pressure column. Operation in this mode increases oxygen recovery at a given rate of compressed and purified air feed or reduces the amount air feed required to produce a given rate of oxygen product. Argon recovery can be integrated efficiently with the intermediate pressure vaporization and work expansion steps.

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Latimer, R. E., "Distillation of Air", Chemical Engineering Progress, 63 (2), 35-59 (1967).

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