Patent ID: 7250140

Claim:
A fluid catalytic reactor system, comprising: a reactor vessel having an inner reactor vessel wall defining a space within said reactor vessel, an upper end, and a lower end; at said upper end a single centrally positioned primary cyclone having a gas-solids inlet for receiving gas and solid particles fluidly connected to the downstream end of a fluid catalytic riser, which said fluid catalytic riser is positioned externally from said reactor vessel; wherein said primary cyclone further is provided with a gas outlet conduit at its upper end fluidly connected to a secondary cyclone separator, which said secondary cyclone separator is positioned in the space between the centrally positioned primary cyclone and the inner reactor vessel wall of the reactor vessel and which said secondary cyclone comprises means to discharge solids to the lower end of the reactor vessel and means to discharge a gaseous stream poor in solids to a gas outlet of the reactor vessel; wherein said primary cyclone is further provided with a lower tubular part defining a primary stripping zone at its lower end and means to discharge pre-stripped solids from the primary cyclone to the lower end of the reactor vessel; and wherein the reactor vessel further comprises at the lower end of the reactor vessel a secondary stripping zone and means to discharge stripped solids from the reactor vessel.