Patent ID: 6444868
Filing Date: 2002-09-03
Classification: B01J,C07C,C10G,Y02P

Abstract:
A method for converting an oxygenate feedstock to an olefin product comprising:contacting an oxygenate feedstock with silicoaluminophosphate catalysts in a first reaction zone of a reactor system under conditions effective to produce a first olefin product stream comprising light olefins and C4+ olefins; directing at least a portion of the catalysts from the first reaction zone and the first olefin product stream to a second reaction zone; directing at least a portion of the catalysts in the second reaction zone to a regenerator; regenerating the at least a portion of the catalysts in the regenerator to form regenerated catalysts; directing the regenerated catalysts from the regenerator to the second reaction zone; and contacting the first olefin product stream with at least a portion of the,regenerated catalysts in the second reaction zone of the reactor system wherein C4+ olefins are converted to light olefins, thereby producing a final olefin product.