Triple column distillation system for oxygen and pressurized nit

Refrigeration – Processes – Circulating external gas

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62 39, 62 41, F25J 302

Patent

active

053416465

ABSTRACT:
The present invention relates to an improved cryogenic process for the separation of air to produce an oxygen product and a nitrogen product. The present invention employs a distillation column system with three distillation columns, a low pressure column, a medium pressure column and a high pressure column. The improved three column distillation system process comprises: (a) producing an oxygen product with a product purity of less than 98% purity oxygen and producing no argon product; (b) producing a gaseous nitrogen product which represents greater than 35% of the feed air and which is removed from the medium and/or high pressure columns; (c) recovering a major portion of the oxygen product from the low pressure column; and (d) condensing at least a portion of the high pressure nitrogen overhead from the high pressure column by heat exchange against a liquid stream in the medium pressure column and utilizing at least a portion of the condensed portion to provide reflux to the high pressure column.

REFERENCES:
patent: 5080703 (1992-01-01), Rathbone
patent: 5163296 (1992-11-01), Ziemer et al.
patent: 5230217 (1993-07-01), Agrawal et al.
patent: 5231837 (1993-08-01), Ha
patent: 5245832 (1993-09-01), Roberts
patent: 5251451 (1993-10-01), Xu et al.
patent: 5257504 (1993-11-01), Agrawal
Latimer, R. E., "Distillation of Air"--CEP--Feb. 1967--pp. 35-59.

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