Air separation with medium pressure enrichment

Details Air separation with medium pressure enrichment Air separation with medium pressure enrichment

1982-09-13

1984-02-28

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 22, 62 28, 62 30, 62 31, 62 33, 62 34, 62 42, F25J 304

Patent

active

044339895

ABSTRACT:
A cryogenic air separation process is disclosed wherein the low pressure column section of a doubler is caused to operate closer to equilibrium and, hence, more efficiently by incorporating a medium pressure column which further enriches HP column enriched oxygen liquid before introduction into the LP column. The MP column is reboiled by indirect heat exchange with condensing HP column nitrogen, and is refluxed by direct injection of condensed nitrogen.
A second improvement to cryogenic air separation is disclosed which can be advantageously combined with the above improvement, in which pressurized oxygen up to 10 ATA is efficiently produced from pumped LOX by using the pumped LOX to reflux an auxiliary higher pressure column in which a fraction of the supply air compressed to higher pressure is separated into liquid N.sub.2 which is subsequently used as reflux and into oxygen enriched liquid which is further separated.

REFERENCES:
patent: 2699046 (1955-01-01), Etienne
patent: 3500651 (1970-03-01), Becker
patent: 4254629 (1981-03-01), Olszewski

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