METHOD FOR RECOVERING OLEFIN FROM OLEFIN/HYDROGEN MIXTURE

摘要

PROBLEM TO BE SOLVED: To provide a method for recovering olefins from a mixed gas containing olefins and hydrogen. SOLUTION: The method comprises: cooling a feedstock gas 1 in the first condensation zone 3 to cause partial condensation to thereby yield the first vapor 7 enriched with hydrogen and the first liquid 5 enriched with olefins; introducing the vapor 7 into a hydrogen/olefin separation process 13, from which a flow 15 enriched with hydrogen and an intermediate flow 19 enriched with olefins are taken out; introducing the flow 19 into the second condensation zone 23, where the flow 19 is further cooled with a dephlegmator to cause partial condensation and fractionation; and taking out the second liquid 25 more enriched with olefins and the second vapor 27 reduced in olefin content from the dephlegmator.