Patent ID: 8735639

Claim:
A method for converting an oxygenate-containing feed stream to an olefin-containing product stream comprising: providing a first fluidized catalytic reactor for converting methanol to propylene and heavy olefins; providing a second fluidized catalytic reactor connected to the first fluidized bed reactor for cracking heavy olefins having four carbon atoms or greater into propylene; providing a catalyst system in a fluidized stream into the first fluidized catalytic reactor and into the second fluidized catalytic reactor, wherein the catalyst system comprises a first catalyst and a second catalyst, the first catalyst being a non-zeolite molecular sieve catalyst and the second catalyst being a zeolite molecular sieve catalyst, and wherein the inlet temperature of the second reactor is at least 15° C. higher than the inlet of the first reactor; providing the oxygenate-containing feed stream in a gaseous form under pressure to an inlet of the first fluidized bed reactor; fluidizing the catalyst system with the gaseous oxygenate-containing feed stream from said inlet against gravity; converting a portion of the oxygenate-containing feed stream into the olefin-containing product stream; directing the olefin-containing product stream from the first fluidized catalytic reactor to a recovery unit; and passing catalyst from the first fluidized catalytic reactor and the second catalytic reactor to a catalyst regenerating unit for removing a portion of a coke deposit from the catalyst particles.