Cryogenic process for producing low-purity oxygen

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

1989-04-13

1990-08-14

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 24, 62 44, F25J 304

Patent

active

049476491

ABSTRACT:
This invention relates to an improved cryogenic separation process employing a single pressure distillation column for the recovery of low purity, high pressure oxygen. The process uses two working fluids, i.e., high pressure air and high pressure nitrogen to effect reboil in the column. Both the condensed air and nitrogen streams are fed as reflux streams to the distillation column. The use of nitrogen reflux enhances oxygen recovery by enhancing purity of the nitrogen from the column.

REFERENCES:
patent: 4224045 (1980-09-01), Olszewski et al.
patent: 4303428 (1981-12-01), Vandenbussche
patent: 4382366 (1983-05-01), Gaumer
patent: 4464188 (1984-08-01), Agrawal et al.
patent: 4655809 (1987-04-01), Shenoy
patent: 4707994 (1987-11-01), Shenoy et al.

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