Patent ID: 7332134

Claim:
An oxygenates to olefins fluidized bed reactor apparatus for converting an oxygenate feed to olefins in a riser reactor which comprises: (a) an oxygenate feed line communicating with a riser reactor feed inlet to said riser reactor, said riser reactor further comprising a riser reactor outlet for riser reactor effluent containing solid catalyst particles and olefins-containing vapor; (b) a preheater through which said oxygenate feed line passes for at least partially vaporizing said feed by heat exchange with a fluid heating medium flowing through said preheater; (c) a disengaging vessel for receiving said riser reactor effluent and separating at least some of said solid catalyst particles from said effluent, said disengaging vessel further comprising a disengaging vessel outlet at an upper portion of said vessel for removing said olefins-containing vapor; (d) a catalyst circulation line running downward from a lower portion of said disengaging vessel to a lower portion of said riser reactor; (e) a regenerator comprising a lower inlet for introducing a regeneration medium, an upper outlet for regenerator flue gas, said regenerator further comprising a first catalyst transport line running downwardly from a lower portion of said disengaging vessel to a regenerator catalyst inlet on the regenerator, and a second catalyst transport line extending downwardly from a regenerated catalyst outlet on the regenerator and intersecting with a lift gas riser, said lift gas riser having an upper outlet at said disengaging vessel anti a lower lift gas inlet; and (f) a regenerator catalyst circulation control valve means for controlling the passage of catalyst from said regenerated catalyst outlet to said lift gas riser, and being manipulated as a function of riser set reactor temperature; and (g) a catalyst circulation control valve means for controlling circulation of catalyst from said disengaging vessel to said riser reactor, and being manipulated as a function of the difference in pressure between an upper portion of said riser reactor and a lower portion of said riser reactor.