Patent ID: 7663012
Filing Date: 2010-02-16
Classification: C07C,Y02P

Abstract:
1. A continuous process for selective conversion of an oxygenate feed to propylene wherein said oxygenate feed is consisting of at least 75% by weight DME, said continuous process comprising the steps of: a) reacting the oxygenate feed and a diluent in an amount corresponding to about 0.1 to 5:1 moles of diluent per mole of oxygenate with dual-function catalyst particles containing a molecular sieve, having the ability to convert at least a portion of the oxygenate to C b) passing the effluent stream to a separation zone and therein cooling and separating the effluent stream into a vaporous fraction rich in C c) recycling at least a portion of the water fraction recovered in step b) to step a) to provide at least a portion of the diluent used therein; d) separating the vaporous fraction into a C e) recycling at least a portion of the C f) withdrawing coke-containing dual-function catalyst particles from the reaction zone, oxidatively regenerating the withdrawn catalyst particles in a regeneration zone and returning a stream of regenerated catalyst particles to the reaction zone.