Patent ID: 7977521
Filing Date: 2011-07-12
Classification: B01J,C10G,Y10S

Abstract:
1. A process for forming olefin product, comprising: contacting supercritical oxygenate in a reactor with molecular sieve catalyst to form an olefin product comprising olefin, water and unreacted oxygenate at a temperature of at least 275° C. and a total reactor pressure of at least 200 bar (20 MPa) such that all non-solid phase components are supercritical, therein forming coked or partially coked molecular sieve catalyst; reducing pressure, temperature or a combination of pressure and temperature of the olefin product below supercritical; and separating at least a portion of the olefin from the water and unreacted oxygenate; and wherein less than 30% of the molecular sieve catalyst is withdrawn from the reactor or reaction zone and exposed to regeneration conditions comprising contacting the coked or partially coked molecular sieve catalyst with a supercritical fluid to extract at least a portion of the coke from cages of the catalyst.