Patent ID: 6987208

Claim:
A process for at least partially removing oxygenate impurities from an olefin-containing stream produced by an oxygenate to olefin process which comprises: contacting an oxygenate feedstream with an olefin generation catalyst under conditions sufficient to provide a first product stream which contains C 2 to C 4 olefins, C 2 to C 4 paraffins, hydrogen, methane, oxygenates comprising dimethyl ether, and highly unsaturated C 2 to C 4 by-products comprising a member selected from the group consisting of an alkyne and an alkadiene; exposing at least a portion of said product stream to a supported metal catalyst comprising i) at least one member selected from the group consisting of group 8 (VIIIA) metal, group 8 (VIIIA) metal compound, group 9 (VIIIA) metal, group 9 (VIIIA) metal compound, group 10 (VIIIA) metal, group 10 (VIIIA) metal compound, group 11 (IB) metal, and group 11 (IB) metal compound, of the Periodic Table, and ii) at least one of a porous inorganic oxide and microporous crystalline molecular sieve, said exposing taking place at conditions sufficient to convert said dimethyl ether to at least one higher boiling product; and removing at least some of said higher boiling product.