Patent ID: 7829030

Claim:
A process for fluidizing catalyst particles in a regenerator, wherein the process comprises the step of: (a) providing a plurality of at least partially coked catalyst particles in the regenerator consisting of a single regeneration zone, wherein the catalyst particles have a d 2 particle size of about 40 microns or more, which means that 2 percent, by volume, of particles 40 microns in average particle size or greater have a particle diameter that is less than the average particle sizes of 40 microns or more; (b) contacting the catalyst particles with a regeneration medium under conditions effective to cause the catalyst particles to behave in a fluidized manner and form a fluidized bed, wherein the regenerator zone comprises a reaction zone and a separation zone; (c) contacting the particles with one or more longitudinally adjacent primary obstructing members while in the fluidized bed; and (d) contacting a feedstock comprising an oxygenate with the plurality of the catalyst particles in a separate riser reactor under conditions effective to convert the oxygenate to light olefins and water; and (e) further comprising one or more secondary obstructing members situated within the separation zone for at least partially obstructing the upward flow of entrained catalyst wherein the at least partially coked catalyst particles and a regeneration medium are fed from the bottom of the regenerator and the at least partially regenerated catalyst particles are drawn from the bottom of the bed or from within the bed.