Nitrogen partial expansion refrigeration for cryogenic air separ

Details Nitrogen partial expansion refrigeration for cryogenic air separ Nitrogen partial expansion refrigeration for cryogenic air separ

1986-07-15

1989-01-10

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

62 34, 62 39, 62 44, F25J 304

Patent

active

047964316

ABSTRACT:
The invention provides a means of producing at least one of high purity nitrogen and low to medium purity oxygen (up to about 97% purity) at high recovery (above 96% for oxygen). The LP column efficiency is improved to reduce the energy requirement, without offsetting reduction in LN.sub.2 reflux availability. Referring to FIG. 1, this is done by providing intermediate height reboil to LP column 3 by a latent heat exchanger 10 in which HP rectifier 5 overhead N.sub.2 vapor which has been partially expanded in expander 9 is condensed and kettle liquid is evaporated. The condensed N.sub.2 is then used to reflux column 3 after depressurization by valve 13.

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

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