Cycle to produce low purity oxygen

Details Cycle to produce low purity oxygen Cycle to produce low purity oxygen

1986-08-20

1987-11-03

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 43, 62 32, F25J 302

Patent

active

047041480

ABSTRACT:
In a process, utilizing high and low pressure distillation columns, for the separation of air to produce low purity oxygen and waste nitrogen streams, feed air from the cold end of the main heat exchangers is used to reboil a low pressure distillation column and to vaporize the low purity oxygen product. This heat duty for column reboil and product vaporization is supplied by splitting the air feed into at least three substreams. One of the substreams is totally condensed and used to provide reflux to both the low pressure and high pressure distillation column, preferably the substream which is fed to the oxygen vaporizer, while a second substream is partially condensed with the vapor portion of the partially condensed substream being fed to the bottom of the high pressure distillation column and the liquid portion providing reflux to the low pressure column. The third substream is expanded to recover refrigeration and then introduced to the low pressure column as column feed. Additionally, the high pressure column condenser is used as an intermediate reboiler in the low pressure column.

REFERENCES:
patent: 3210951 (1965-10-01), Gaumer
patent: 3277655 (1966-10-01), Geist et al.
patent: 3327489 (1967-06-01), Gaumer
patent: 3754406 (1973-08-01), Allam
patent: 3763658 (1973-10-01), Gaumer, Jr. et al.
patent: 4433989 (1984-02-01), Erickson
patent: 4464191 (1984-08-01), Erickson
patent: 4615716 (1986-10-01), Cormier et al.
patent: 4617036 (1986-10-01), Suchdeo et al.
patent: 4617037 (1986-10-01), Okada et al.

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