Fractionation system for stabilizing natural gasoline

Details Fractionation system for stabilizing natural gasoline Fractionation system for stabilizing natural gasoline

1988-05-11

1990-01-30

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 24, 62 28, 62 34, F25J 302

Patent

active

048970980

ABSTRACT:
Improved operation of an LPG fractionating facility having a deethanizer, depropanizer and debutanizer is obtained by operating the deethanizer at a lower pressure than conventional, (e.g., less than 500 psig), thereby reducing the temperature of the deethanizer bottoms such that the debutanizer operated at greater than conventional pressure (e.g., over 100 psig) produces a mixed butane overhead at a higher temperature than the deethanizer bottoms whereby the mixed butane overhead is condensed and cooled by indirect contact with the deethanizer bottoms thereby heating the bottoms and supplying a substantial portion of the energy required for the fractionation in the deethanizer. The energy reduction for the three column system through the improved heat recovery system is 10% to 50% depending upon the feed composition.

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