Patent ID: 6613290
Filing Date: 2003-09-02
Classification: B01F,B01J,C10G

Abstract:
A fluidized catalytic cracking system, comprising:a riser having an outer surface and an inner surface, the inner surface defining a central passage extending substantially along a longitudinal axis of the riser for transporting a hydrocarbon feedstock and a catalytic material, the inner surface having a plurality of elongated ribs disposed thereon for mixing the hydrocarbon feedstock and the catalytic material, the ribs having an inner wall that faces the central passage, the ribs having a thickness defined by a distance between the inner wall and the outer surface of the riser, the thickness varying along at least a portion of the length of the ribs, wherein said central passage includes a lift zone located proximate the bottom of the riser, a feed-injection zone downstream and adjoining said lift zone, and a reaction zone downstream and adjoining said feed-injection zone, wherein a plurality of atomizing nozzles is coupled to the riser, the atomizing nozzles being adapted to inject the hydrocarbon feedstock into a flow of the catalytic material within the central passage so that the atomizing nozzles form a spray pattern of the hydrocarbon feedstock within the central passage, and wherein each of the plurality of elongated ribs is disposed within the feed injection zone of said riser between adjacent atomizing nozzles.