Patent ID: 7687675

Claim:
A process for reducing deactivation of catalyst used in converting oxygenate to an olefin composition, comprising the steps of: a) providing a catalyst that comprises silicoaluminophosphate crystals; b) contacting the oxygenate with the catalyst in a reactor to form the olefin composition and a coked catalyst; c) sending at least a portion of the coked catalyst in the reactor to a regenerator; and d) contacting the coked catalyst with regeneration gas comprising substantially oxygen in the regenerator so as to remove at least a portion of the coke composition on the coked catalyst heated to an average regenerator temperature higher than an average reactor temperature but not greater than 690° C., wherein the regenerator has a water partial pressure of not greater than 3.82 psia (26.3 kPa) wherein the coked catalyst is heated prior to contacting with regeneration gas to reduce the water partial pressure in the regenerator.