Refrigeration – Processes – Circulating external gas
Patent
1986-08-01
1988-04-12
Warner, Steven E.
Refrigeration
Processes
Circulating external gas
62 27, 62 34, 62 38, F25J 304
Patent
active
047371773
ABSTRACT:
The inefficiency of the nitrogen stripping section of a high purity oxygen-producing air distillation plant is reduced. This allows increased recovery of byproduct argon and in some cases increased recovery of refrigeration work also. The improvement is obtained by evaporating kettle liquid with condensing argon rectifier vapor in two sequential stages, to yield vapor streams respectively having more and less O.sub.2 content than the kettle liquid, and separately feeding them to the N.sub.2 removal column. The improvement is applicable to both dual and triple pressure processes. Referring to FIG. 1, kettle liquid is supplied via valve 11 to the top of contactor 18, and overhead reflux condenser 13 of argon rectifier 14 reboils the bottom of contactor 18. Vapor streams of differing O.sub.2 composition are withdrawn from above and below 18.
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C. Judson King, "Separation Processes," McGraw-Hill Book Co., 1980, p. 221.
Streich, et al., "Production of Large Quantities of Oxygen by an Improved Two Column Process," International Congress of Refrigeration 1979, pp. 513-519.
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