Patent ID: 9505670
Filing Date: 2016-11-29
CPC Classification: C07C,Y02P

Claim Text:
1. A process for the preparation of an olefinic product comprising ethylene and/or propylene from an oxygenate, the process comprising the following steps: a) contacting the oxygenate in an oxygenate conversion reaction zone with a molecular sieve-comprising catalyst at a temperature in the range of from 350 to 1000° C. to produce an oxygenate conversion effluent comprising olefins, water, carbon dioxide and carbonyl compounds including C2 b) separating water from the oxygenate conversion effluent to obtain a water-depleted gaseous oxygenate conversion effluent comprising olefins, carbon dioxide and C2 c) compressing the water-depleted gaseous effluent with the optional removal of any condensed phase to obtain a compressed gaseous stream comprising olefins, carbon dioxide and C2 d) separating carbon dioxide from the compressed gaseous stream by subjecting the compressed gaseous stream to a caustic wash treatment in a caustic tower wherein the gaseous stream is countercurrently contacted with a caustic solution to obtain a washed gaseous stream comprising olefins; and e) subjecting the washed gaseous stream to one or more separation steps such that at least an olefin product stream comprising ethylene and/or propylene is obtained, wherein in step d) a non-aqueous liquid stream comprising one or more aromatic C7