Air partial expansion refrigeration for cryogenic air separation

Details Air partial expansion refrigeration for cryogenic air separation Air partial expansion refrigeration for cryogenic air separation

1986-12-24

1988-10-18

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

62 25, 62 29, 62 38, 62 44, F25J 304

Patent

active

047778032

ABSTRACT:
The invention provides an improved means of producing the refrigeration required for any fractional distillation air separation process. The improved refrigeration technique causes the distillation columns to operate more efficiently, and thereby permits increased recovery and/or purity of product at lower energy input. Referring to FIG. 3, refrigeration air is partially expanded in expander 313, then condensed by exchanging latent heat with depressurized kettle liquid in condenser 314, and the resulting liquid air is split and used to reflux both columns 307 and 305 via pump 316 and valve 315 respectively.

REFERENCES:
patent: 4578095 (1986-03-01), Erickson
patent: 4582518 (1986-04-01), Erickson
patent: 4604116 (1986-08-01), Erickson
patent: 4662917 (1987-05-01), Cormier, Sr. et al.
patent: 4670031 (1987-06-01), Erickson

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