Vented riser apparatus and method
AssigneeUop LLC
InventorsDavid A. Lomas, Edward C. Haun, Paul A. Sechrist
Life of this patent
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Abstract
An FCC process and apparatus is arranged to provide a low volume dilute disengagement zone in a reactor vessel. A vented riser that provides an open discharge of catalyst and gaseous products is directly discharged into a reactor vessel. The interior of the reactor vessel is arranged such that the outlet of the reactor riser is located close to and directed at the top of the reactor vessel. The reactor vessel operates with a dense bed of catalyst having an upper bed level that is only a short distance below the outlet of the reactor riser. The cyclone separators are located to the outside of the reactor riser and circulate catalyst back to the dense bed of the reactor section.
Claims7
An apparatus for the fluidized catalytic cracking (FCC) of an FCC feedstock, said apparatus comprising:
- (a) an upwardly directed riser conduit having an upwardly directed outlet end;
- (b) a reactor vessel having an upper end surrounding said outlet end and defining an open disengagement zone wherein the top of said reactor vessel is located 5 to 12 riser diameters above said outlet end;
- (c) a gas solid separation device located outside of said reactor vessel having an inlet, a gas outlet, and a solids outlet;
- (d) means for collecting a mixture of gas and catalyst from said open disengagement zone of said reactor vessel into the inlet of said separation device;
- (e) means for returning catalyst particles from said gas solid separation device to said reactor vessel;
- and
- (f) means for withdrawing catalyst from the bottom of said reactor vessel and transferring catalyst to a regeneration vessel.
Dependencies are inferred from the claim text.