Patent ID: 6649130
Filing Date: 2003-11-18
Classification: B01J,C07C,Y02P

Abstract:
An apparatus for the ammoxidation of propene to acrylonitrile by contact with a particulate catalyst, said apparatus comprising:a first vessel defining a dense phase reaction zone having a first transverse flow area and at least one reactant inlet for receiving propylene and/or ammonia reactants; an indirect heat exchange surface on the interior of the first vessel for indirectly cooling the dense bed reaction zone; a second vessel defining a circulating fluidized bed (CFB) reaction zone having a second transverse flow area that is less than the first transverse flow area and having a reactant outlet; a reducer for joining an outlet end of the first vessel with an inlet end of the second vessel and establishing a reactant and catalyst flow path from the first vessel through the reducer and the second vessel and out of the reactant outlet; at least one oxygen injector for introducing an oxygen-containing stream into the reducer or the second vessel along the reactant and catalyst flow path; at least one separator in communication with the reactant outlet to separate catalyst particles from a reactant stream; and, a separator outlet for delivering the reacted stream.