Process for the separation of C.sub.5+ hydrocarbons from a gase

Details Process for the separation of C.sub.5+ hydrocarbons from a gase Process for the separation of C.sub.5+ hydrocarbons from a gase

1987-06-16

1988-09-20

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

62 27, 62 31, 62 39, 62 41, F25J 302

Patent

active

047723017

ABSTRACT:
For the separation of C.sub.5+ hydrocarbons from a gaseous stream containing light hydrocarbons, C.sub.1 -C.sub.5, and, in some cases, lower boiling components, e.g., hydrogen, the gaseous feedstream, under pressure, is cooled, partially condensed, and separated into a liquid fraction and a gaseous fraction. The liquid fraction is separated by rectification under a lower pressure into a product stream consisting essentially of C.sub.5+ hydrocarbons and a residual gas stream predominating in components lower boiling than C.sub.5. The gaseous fraction separated after the partial condensation is introduced into a recontacting column wherein C.sub.5+ components still contained in the gas are scrubbed out. The scrubbing step is performed with a partial condensate of the overhead product of the rectification. The loaded scrubbing liquid is then introduced into the rectification as reflux.

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