Patent ID: 7115791
Filing Date: 2006-10-03
Classification: C07C,Y10S

Abstract:
1. A process for controlling an oxygenates to olefin reactor to provide a substantially consistent effluent composition, which process comprises: contacting an oxygenate-containing feedstock in a reaction zone in the presence of a molecular sieve oxygenate to olefins conversion catalyst under reactor conditions sufficient to provide an olefins-containing effluent containing alkyl alcohol and dialkyl ether; analyzing a single gas phase of said olefins-containing effluent containing alkyl alcohol and dialkyl ether to determine alkyl alcohol concentration and dialkyl ether concentration of said effluent; adjusting said reactor conditions as a function of said alkyl alcohol concentration and said dialkyl ether concentration, as necessary to provide said substantially consistent effluent composition, wherein said adjusting of reactor conditions is carried out by one or more of: a) varying WHSV within said reaction zone; b) varying the level of coke which deposits on said conversion catalyst within said reaction zone; c) varying the reaction temperature within said reaction zone; d) varying the amount of said oxygenate-containing feedstock provided to said reaction zone as a liquid, relative to the amount of said oxygenate-containing feedstock provided to said reaction zone as a vapor; or e) varying heat input to a feed pre-heater used for pre-heating said oxygenate-containing feedstock prior to said contacting with said conversion catalyst; and wherein said analyzing is carried out under conditions sufficient to permit said adjusting based on said analyzing to occur within about fifteen seconds from the time said effluent is provided.