Air separation schemes for oxygen and nitrogen coproduction as g

Details Air separation schemes for oxygen and nitrogen coproduction as g Air separation schemes for oxygen and nitrogen coproduction as g

1993-09-23

1994-10-18

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 38, 62 41, F25J 302

Patent

active

053556810

ABSTRACT:
The present invention is an improvement to a cryogenic distillation process for the separation of air into its constituent components. The present invention process uses a distillation column system which comprises at least two distillation columns wherein the top of the higher pressure column is in thermal communication with the lower pressure column. The distinctive feature and improvement of the present invention comprise: (a) condensing a portion of the compressed, contaminant-free, feed air by appropriate means, such as against vaporization of liquid oxygen or other source of refrigeration; (b) using at least a portion of this liquid air as impure reflux in one of the distillation columns, and (c) removing a waste vapor stream from a location situated no more than four theoretical stages above the location where the liquid air is fed to the column, such that this waste vapor stream has a nitrogen mole fraction of less than 0.95.

REFERENCES:
patent: 3426543 (1969-02-01), Becker
patent: 3605422 (1971-09-01), Pryor et al.
patent: 4006001 (1977-02-01), Schonpflug
patent: 4152130 (1979-05-01), Theobald
patent: 4717410 (1988-05-01), Grenier
patent: 5098457 (1992-03-01), Cheung et al.
patent: 5165245 (1992-11-01), Agrawal et al.

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