Companded total condensation reboil cryogenic air separation

Details Companded total condensation reboil cryogenic air separation Companded total condensation reboil cryogenic air separation

1987-02-03

1988-09-06

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

62 25, 62 34, 62 39, F25J 304

Patent

active

047690550

ABSTRACT:
In a cryogenic air distillation process for producing medium-to-high purity oxygen plus optional coproduct argon, a new process sequence results in more efficient distillations at reduced supply pressure and full O.sub.2 recovery. Reforming to FIG. 2, a minor stream of supply air is additionally compressed by compander 204, cooled, and then reboils column 201 by total condensation in reboiler 205. The liquid air is split into two intermediate reflux streams, one for each column 201 and 202, valves 206 and 207, thereby improving the efficiency of both columns. The air condensing in 205 is somewhat hotter than that supplied to 202, due to its higher pressure, which permits a reduction in the main supply pressure.

REFERENCES:
patent: 3905201 (1975-09-01), Coveney et al.
patent: 4224045 (1980-09-01), Olszewski et al.
patent: 4357153 (1982-11-01), Erickson
patent: 4533375 (1985-08-01), Erickson
patent: 4543115 (1985-09-01), Agrawal et al.
Streich, et al., "Production of Large Quantities of Oxygen by an Improved Two-Column Process," XIV Internatinal Congress of Refrigeration, pp. 513-519.

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