Cryogenic system for producing low-purity oxygen

Details Cryogenic system for producing low-purity oxygen Cryogenic system for producing low-purity oxygen

1980-05-01

1981-03-10

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 29, 62 38, F25J 304

Patent

active

042546290

ABSTRACT:
Low purity oxygen is produced by factional distillation of liquefied air in a double distillation column and an auxiliary distillation column. Feed air is supplied at two different pressures. The disclosed methods of handling intermediate oxygen-enriched liquid produced by the two columns and removing nitrogen-rich gas from the auxiliary distillation column permit the system to operate with lower energy requirements and smaller column diameter than conventional systems.

REFERENCES:
patent: 2209748 (1940-07-01), Schlitt
patent: 2664719 (1954-01-01), Rice et al.
patent: 2682162 (1954-06-01), Langer
patent: 2765637 (1956-10-01), Etienne
patent: 2812645 (1957-11-01), Locklair et al.
patent: 2934907 (1960-05-01), Scofield
patent: 3066494 (1962-12-01), Potts

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