Process for the cryogenic distillation of an air feed to produce

Details Process for the cryogenic distillation of an air feed to produce Process for the cryogenic distillation of an air feed to produce

1994-05-10

1995-06-20

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 24, F25J 304

Patent

active

054252415

ABSTRACT:
A process is set forth for the cryogenic distillation of an air feed to produce an ultra-high purity oxygen product. A first oxygen-containing but heavy contaminants-lean (free) stream is removed from the main distillation column system and subsequently stripped in an auxiliary distillation column. A second oxygen-containing but light contaminants-lean (free) gaseous stream is also removed from the main distillation column system and subsequently fed to the bottom section of the auxiliary distillation column in order to provide heat duty/reboil to the bottom of the auxiliary distillation column. The ultra-high purity oxygen product (ie total contaminant concentration less than 10.0 vppm, preferably less than 1.0 vppm) is withdrawn from an intermediate section of the auxiliary distillation column.

REFERENCES:
patent: 5049173 (1991-09-01), Cormier et al.
patent: 5129932 (1992-07-01), Agrawal et al.
patent: 5351492 (1994-10-01), Agrawal et al.

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