Patent ID: 8143470

Claim:
A method of purifying olefin, comprising the steps of: 1) preparing an ionic liquid mixture comprising copper (I) halide by dissolving copper (I) halide represented by Formula 1 in a pyrrolidinium-based ionic liquid represented by Formula 2 or a piperidinium-based ionic liquid represented by Formula 3; and 2) contacting said ionic liquid mixture comprising copper (I) halide with olefin to remove acetylenic compounds from the olefin wherein X is Cl, Br or I, R 1 is a C 1 ˜C 6 alkyl group, R 2 is a C 1 ˜C 6 alkyl group or alkoxy group, Y is a phosphite anion represented by Formula 4 or a phosphate anion represented by Formula 5, wherein R 3 is a C 1 ˜C 6 alkyl group.