Patent ID: 8178741
Filing Date: 2012-05-15
Classification: B01J,C07C,Y02P

Abstract:
1. A method of regenerating a molecular sieve catalyst for converting oxygenates into olefins, comprising: a) in a pretreatment stage, pretreating a molecular sieve catalyst under pretreatment conditions by heating the catalyst at a pretreatment temperature of between 300° C. to 700° C. in an oxygen depleted medium wherein in the pretreatment stage the catalyst is heated at a first pretreatment temperature for a first residence time of between 1 minute to 2 hours followed by increasing the temperature to a second pretreatment temperature and maintaining the second pretreatment temperature for a second residence time of between 1 minute to 2 hours, wherein the first pretreatment temperature is between 300° C. to 400° C. and the second pretreatment temperature is between 400° C. to 700° C., followed by cooling the catalyst to room temperature; and b) in a regeneration stage, regenerating the cooled catalyst under regeneration conditions by heating the catalyst at a regeneration temperature of between 350° C. to 500° C. in an oxidizing medium for a regeneration residence time of between 1 minute to 2 hours.