Patent ID: 7232936

Claim:
A process for converting oxygenate to an olefin-containing product, comprising: introducing oxygenate into a reactor system at plural stages along a flow axis of a reactor catalyst bed; contacting said oxygenate with an oxygenate to olefin conversion molecular sieve catalyst under oxygenate to olefin conversion conditions; and recovering an olefin-containing product which contains a higher proportion of ethylene than a product produced from a process which differs only by introducing oxygenate at a single stage along a flow axis of the reactor catalyst bed wherein said oxygenate is selected the group consisting of methanol, dimethyl ether, and the mixture thereof, said reactor catalyst bed comprises a fluidized bed reaction zone which includes a top portion, a bottom portion, and an intermediate portion extending between the top portion and the bottom portion, wherein said oxygenate is introduced at a first location at or near the bottom portion of the fluidized bed reaction zone, and at a second location in the intermediate portion of the fluidized bed reaction zone.