Economic recovery of ethylene and/or propylene from low concentr

Details Economic recovery of ethylene and/or propylene from low concentr Economic recovery of ethylene and/or propylene from low concentr

1981-09-11

1983-08-30

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 17, 62 28, 62 39, F25J 302

Patent

active

044014503

ABSTRACT:
C.sub.2 -C.sub.3 olefins are recovered from a low concentration gaseous feedstream, e.g. a Fischer-Tropsch waste gas. In a first process stage, the weight percent concentration of the olefins is enriched to at least about 25%. One specific enrichment technique includes scrubbing, preferably 2-stage scrubbing, with hydrocarbon scrubbing agents. Another technique comprises condensation of the olefin in regenerators and absorbing same in a purge phase. The resultant enriched stream, in any case, is then subjected to conventional low temperature separation to recover relatively pure individual streams of ethylene and propylene.

REFERENCES:
patent: 2855433 (1958-10-01), Cobb, Jr.
patent: 2886611 (1959-05-01), King et al.
patent: 3074245 (1963-01-01), Becker
patent: 3143406 (1964-08-01), Becker
patent: 3169052 (1965-02-01), Davison
patent: 3192732 (1965-07-01), Cahn
patent: 3276212 (1966-10-01), Ichihara

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