Patent ID: 6491875
Filing Date: 2002-12-10
Classification: C10G

Abstract:
An apparatus for the fluidized catalytic cracking of hydrocarbons, said apparatus comprising:an elongated combustion riser having a length-to-diameter ratio of at least 10; a spent catalyst conduit for delivering spent catalyst to said combustion riser; â€œa distributor at least partially inside said combustion riserâ€  for supplying combustion gas to said combustion riser and passing a stream of catalyst and combustion gases up said combustion riser; â€œsaid length-to-diameter ratio being determined by the cross-section of said combustion riser at said distributor;â€ a separation vessel having an upper portion of said combustion riser extending into a central portion thereof; at least two curved conduits located in said separation vessel, said curved conduits communicating with and extending radially from said combustion riser, each curved conduit defining a discharge opening and having an arrangement for the tangential discharge of said stream into said separation vessel; a gas recovery conduit defining a gas inlet located radially inward from said discharge opening for collecting gaseous fluids from said separation vessel; a cyclone separator in communication with said gas recovery conduit; a regenerated catalyst conduit for withdrawing regenerated catalyst from said separation vessel; and a reaction vessel for receiving regenerated catalyst from said regenerated catalyst conduit and supplying spent catalyst to said spent catalyst conduit.