Enhanced argon recovery from intermediate linboil

Details Enhanced argon recovery from intermediate linboil Enhanced argon recovery from intermediate linboil

1987-06-02

1989-05-23

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

62 31, 62 34, 62 39, F25J 304

Patent

active

048327190

ABSTRACT:
The argon recovery obtainable from a dual pressure cryogenic air distillation plant for production of high purity oxygen is increased beyond present levels without offsetting incurrence of detriments such as lower O.sub.2 pressure, lower O.sub.2 or N.sub.2 recovery, less liquid recovery, or increased energy. This is done by providing an intermediate reflux condenser (component 8 of FIG. 1) in the argon sidearm 2b, and providing liquid N.sub.2 via valve 9 to said condenser, thereby increasing the reboil up both argon stripper 2a and the lower section of 2b proportional to the amount of LN.sub.2 evaporated in 8.

REFERENCES:
patent: 4137056 (1979-01-01), Golovko
patent: 4433989 (1984-02-01), Erickson
patent: 4533375 (1985-08-01), Erickson
patent: 4578095 (1986-03-01), Erickson
patent: 4615716 (1986-10-01), Cormier et al.
patent: 4670031 (1987-06-01), Erickson
Streich, et al., "Production of Large Quantities of Oxygen by an Improved Two-Column Process," Moscow IIR (XIV Congress of Refrigeration), 09-1975, pp. 513-519.
Latimer, "Distillation of Air", Chemical Engineering Progress, vol. 63, No. 2, Feb. 1967, pp. 35-59.

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