Process for the separation of C.sub.2+, C.sub.3+ or C.sub.4+ hy

Details Process for the separation of C.sub.2+, C.sub.3+ or C.sub.4+ hy Process for the separation of C.sub.2+, C.sub.3+ or C.sub.4+ hy

1985-12-17

1987-05-12

Caldarola, Glenn

Refrigeration

Processes

Circulating external gas

208340, 208341, 62 31, 62 34, 62 38, F25J 302

Patent

active

046646876

ABSTRACT:
In a process for the separation of C.sub.2+, C.sub.3+ or C.sub.4+ hydrocarbons from a gas stream containing light hydrocarbons and, if desired, of components boiling lower than methane, in which the gas stream, being under an elevated pressure, is cooled, partially condensed and separated in a phase separator into a liquid and a gaseous fraction; the gaseous fraction is engine expanded, and the liquid fraction is fractionated by rectification into a product stream containing substantially C.sub.2+, C.sub.3+ or C.sub.4+ hydrocarbons and a residual gas stream containing predominantly lower boiling components, the improvement comprising subjecting the gaseous fraction forming after partial condensation, before engine expansion thereof, to heat exchange with the engine expanded gaseous fraction, thereby cooling said gaseous fraction and separating additional components which condense out before the engine expansion stage.

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patent: 4479871 (1984-10-01), Panade et al.
patent: 4486209 (1984-12-01), Fabbri et al.
patent: 4519824 (1985-05-01), Huebel

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