Patent ID: 7531705

Claim:
A process for making an olefin product from an oxygenate feedstock in the presence of an oxygenate to olefin molecular sieve catalyst which comprises: a) contacting at least a portion of the catalyst with a regeneration medium in a regeneration zone at a first temperature; b) feeding to said regeneration zone during a preheat time a heating fuel having an autoignition temperature less than the first temperature and containing less than 500 wppm sulfur and less than 200 wppm nitrogen, thereby causing the heating fuel to ignite and provide a heated catalyst having a temperature of at least 225° C.; c) circulating said heated catalyst to the reaction zone; and d) contacting the feedstock in a reaction zone with said oxygenate to olefin molecular sieve catalyst including said heated catalyst, during the preheat time or thereafter, under conditions effective to convert the feedstock into an olefin product stream comprising light olefins; and then e) polymerizing the light olefins to make polyolefins.