Patent ID: 7722825

Claim:
A reactor system for converting an oxygenate-containing feed stream to an olefin-containing product stream comprising: an inlet to a first fluidized catalytic reactor for introducing an oxygenate-containing feed stream comprising methanol; the first fluidized catalytic reactor for converting methanol to propylene, the first reactor using a fluidized catalyst system comprising a first catalyst and a second catalyst, whereby the first fluidized catalytic reactor generates a product stream comprising propylene and heavy olefins; an inlet to a second fluidized catalytic reactor for introducing heavy olefins from the product stream; and the second fluidized catalytic reactor which is in at least partial fluid communication with the first fluidized catalytic reactor for cracking heavy olefins having four carbon atoms or greater into propylene, the second reactor using said fluidized catalyst system; wherein the first catalyst is a non-zeolite molecular sieve catalyst and wherein the second catalyst is a zeolite molecular sieve catalyst, and wherein the first catalytic reactor is operated at a temperature lower than the second catalytic reactor.