Recovery of C.sub.3+ hydrocarbons

Details Recovery of C.sub.3+ hydrocarbons Recovery of C.sub.3+ hydrocarbons

1985-03-08

1986-08-26

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 31, 62 34, 62 39, A25J 302

Patent

active

046080686

ABSTRACT:
In the recovery of C.sub.3+ hydrocarbons from a feed stream containing hydrogen and C.sub.1 to at least C.sub.5 hydrocarbons, e.g., a refinery waste gas, comprising cooling and partially condensing the feed stream; separating the partially condensed feed stream into a liquid fraction and a gaseous fraction; expanding the gaseous fraction, and fractionating the liquid fraction in a rectification column to obtain product stream consisting essentially of C.sub.3+ hydrocarbons and a residual gas stream product containing predominantly C.sub.2- hydrocarbons, one improvement comprises passing (a) the gaseous fraction prior to expansion; (b) the liquid fraction prior to rectification; and (c) the gaseous fraction after expansion, in indirect heat exchanger relationship with the feed stream to be cooled. Other improvements comprise separate removal of C.sub.1 and C.sub.2 fractions from the hydrogen gas; the use of a C.sub.5+ fraction as a feed to the rectification column and/or as a scrubbing liquid for separating the partially condensed feed stream.

REFERENCES:
patent: 4478621 (1984-10-01), Fabian

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