Patent ID: 7019188

Claim:
A process for separating one or more members selected from the group consisting of C 2-8 mono-olefins, C 4-8 diolefins, and C 6-12 aromatic hydrocarbons which are unsubstituted or substituted by up to three C 1-4 alkyl radicals from a mixture comprising at least one of said members and at least one other hydrocarbon comprising contacting said mixture with an ionic liquid containing a C 5-8 nitrogen containing aromatic compound which is unsubstituted or substituted by up to three C 1-6 alkyl radicals, said ionic liquid having a melting temperature below 80° C., in the absence of a metal complex to preferentially take said one or more members into said ionic liquid, separating said ionic liquid from said at least one other hydrocarbon and regenerating said ionic liquid and releasing said at least one member.