Patent ID: 7332639

Claim:
A process for producing an olefins stream comprising: (a) providing a first vapor effluent stream from an oxygenate to olefin conversion reaction, said first vapor effluent stream comprising C 2 and C 3 olefins, C 4 hydrocarbons, and C 2 to C 6 carbonyl compounds; (b) adjusting the temperature and pressure of the first vapor effluent stream to produce a second vapor effluent stream having a pressure ranging from about 100 psig to about 350 psig (790 to 2514 kPa) and a temperature ranging from about 700° F. to about 120° F. (21 to 49° C.), said second vapor effluent stream containing about 50 wt. % or more of the C 4 hydrocarbons in the first vapor effluent stream; (c) washing the second vapor effluent stream with a liquid alcohol-containing stream to produce a third vapor effluent stream; and (d) washing the third vapor effluent stream with liquid water to provide a fourth vapor effluent stream, said fourth vapor effluent stream comprising about 1.0 wt. % or less C 2 to C 6 carbonyl compounds.