Abstract: A dual riser cracking operation in combination with sequential stages of catalyst regeneration in which the second regeneration stage is a riser regenerator is described in combination with deep solvent deasphalting a vacuum resid. The deasphalted resid is subjected to hydrogenation treatment prior to cracking thereof in a riser cracking zone in admixture with a heavy vacuum gas oil which may or may not be hydrogenated prior to cracking thereof. Lower boiling fractions of the crude oil are subjected to catalytic cracking in a separate riser cracking zone. Partially regenerated catalyst of dense fluid bed regeneration may be employed in the heavy oil feed riser cracking operation charged with deasphalted oil. The partially regenerated catalyst may be used alone or in combination with more completely regenerated catalyst of the riser regeneration operation.

Abstract: A method and arrangement of apparatus is provided for catalytically cracking liquid hydrocarbons to form gaseous and liquid fuel products and effect regeneration of the used catalyst particles whereby means are provided which improve separation of formed suspensions in a substantially reduced time frame and combustion of substantial hydrocarbonaceous deposits is accomplished under restricted temperature conditions contributing to catalyst life in a two stage catalyst regeneration operation of restricted elevation. The apparatus combination of the present invention is preferably of low vertical profile by restricting the vertical length of the riser contact zone in one embodiment by providing a substantial horizontal section thereof in a downstream portion of the riser.

Abstract: A method for catalytically cracking different fractions of crude oil with a zeolite containing catalyst in separate riser regeneration zone followed by sequential regeneration of catalyst particles in separate riser regeneration zones is described wherein the hydrocarbon vapor-catalyst suspension of hydrocarbon conversion is discharged downwardly from a half circle centrifugal separation conduit comprising the riser upper discharge section, second stage riser regeneration of catalyst is discharged downwardly from a half circle centrifugal separation section into the top of a high temperature catalyst recovery zone provided with cyclone separation zones external thereto. The first stage upflow riser regeneration zone is effected with oxygen lean gas and steam in an amount equal to, more or less, than the oxygen containing gas whereby the regeneration temperature is restricted from exceeding a desired upper temperature limit with or without promoting the water gas shift reaction.

Abstract: The method and means of this invention comprises discharging a suspension of solids (inert or catalytic) in gasiform material (whether hydrocarbon vapors, combustion product flue gases, stripping gases or combinations thereof) from a riser contact zone through a plurality of radiating confined passageway emanating from the upper discharge periphery of the riser each of which is in tangential communication at the outer end of the confined passageway with a cylinder open in the bottom end thereof. The cylinder is closed at the top except for a coaxially aligned conduit of smaller diameter extending downwardly through said cylinder with its bottom open end terminating adjacent a lower portion of the inlet of the confined passageway.