Patent ID: 7816575
Filing Date: 2010-10-19
Classification: B01J,B03C,C07C,C10G,Y02P,Y10S

Abstract:
1. A process for removing silicoaluminophosphate molecular sieve catalyst particles containing [AlO 4 ] and [SiO 4 ] tetrahedral units from an oxygenate to olefin reaction system having a reactor and regenerator, comprising: a) exposing the molecular sieve catalyst particles to regeneration conditions to remove carbon; b)separating the molecular sieve catalyst particles from a flue gas stream in the regenerator so that the flue gas stream exits the regenerator at an average catalyst loading of greater than or equal to 10 mg/NM c) flowing the flue gas stream exiting the regenerator through a catalyst fine separation unit to form a final flue gas stream having an average catalyst loading of less than that of the stream exiting the regenerator; wherein the catalyst fine separation unit is an electrostatic precipitator operated at a catalyst resistivity of not greater than 10 12 ohm-cm and a temperature of at least 250° C.