Patent ID: 6482999
Filing Date: 2002-11-19
Classification: B01J,C07C,C10G,Y02P,Y10S

Abstract:
A method for improving the selectivity of light olefins in the process for converting oxygenate feedstocks to olefins, comprising:contacting an oxygenate feedstock with a molecular sieve catalyst under conditions effective to produce a product stream comprising C2-C4 olefins; forming carbonaccous deposits on at least a portion of the molecular sieve catalyst, thereby forming a deactivated catalyst; regenerating at least a portion of the deactivated catalyst under conditions effective to remove at least a portion of the carbonaceous deposits from the portion of deactivated catalyst, thereby forming a regenerated catalyst; and contacting at least a portion of the regenerated catalyst with at least a portion of the product stream including the C2-C4 olefins to form a selectivated catalyst.