| 摘要 |
C2-C3 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.
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