Patent ID: 7005555

Claim:
A process for producing olefin(s) from oxygenate(s), the process comprising the steps of: (a) contacting an oxygenate feed stream with an oxygenate-to-olefin catalyst to produce an effluent stream by using a quench medium comprising carbon dioxide, oxygenate(s), water and olefin(s); (b) quenching the effluent stream to produce a quench bottoms stream comprising carbon dioxide, oxygenate(s) and water and a quenched effluent stream comprising olefins(s) wherein the quench medium has a pH ranging from about 7.1 to about 11.5; (c) separating carbon dioxide from the quench bottoms stream wherein the separating further comprises combining an acidic composition with the quench bottoms stream; (d) separating a majority of the oxygenate(s) from a majority of the water in the quench bottoms stream; and (e) combining the majority of the oxygenate(s) with the oxygenate feed stream.