Patent ID: 6673978
Filing Date: 2004-01-06
Classification: B01J,C07C,C10G,Y02P

Abstract:
A method for conducting an oxygenate conversion reaction in a fluidized bed reactor comprising:providing an oxygenate feedstock, a catalyst that incorporates a SAPO molecular sieve, and a reactor apparatus including at least a reaction zone and a recirculation zone, wherein the temperature in at least one point in each of said reaction zone and said recirculation zone is about 250Â° C. or greater; contacting said feedstock wit said catalyst in said reaction zone under conditions effective to convert said feedstock to a product including prime olefins, said conditions including a GSV of about 0.1 m/s or greater at at least one point in said reaction zone; recirculating at least a portion of said catalyst in said reaction zone flow through said recirculation zone such that a ratio of the mass of said catalyst in said reaction zone to that of the sum of the mass of said catalyst in both said reaction zone and said recirculation zone is from 0.30 to 0.99.