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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

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.

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A method for upgrading a residual portion of a crude oil to form gasoline and light cycle oil which comprises, (a) separating a residual portion of crude oil into a relatively low boiling fraction comprising atmospheric gas oil from a higher boiling fraction of said residual oil, (b) solvent deaspha

A method for upgrading a residual portion of a crude oil to form gasoline and light cycle oil which comprises, (a) separating a residual portion of crude oil into a relatively low boiling fraction comprising atmospheric gas oil from a higher boiling fraction of said residual oil, (b) solvent deasphalting at least the resid portion of vacuum distillation of said higher boiling fraction and recovering a deasphalted oil product from a deasphalting solvent selected from propane, butane, pentane, hexane and combinations thereof, (c) partially hydrogenating said deasphalted oil product in the presence of a heavy vacuum gas oil fraction boiling intermediate said light vacuum gas oil and said vacuum resid, (d) passing said partially hydrogenated oil product mixed with an atomizing diluent material in contact with an upwardly flowing low coke producing crystalline zeolite containing catalyst suspended in a gas comprising hydrogen in a first riser heavy oil feed hydrocarbon conversion zone, (e) passing said separated low boiling fraction of crude oil with light vacuum gas oil in contact with a separate rising suspension of said elevated temperature low coke producing crystalline zeolite containing catalyst suspended in a gas comprising hydrogen in a second riser hydrocarbon conversion zone, (f) effecting a partial centrifugal separation between hydrocarbon conversion product vapors and catalyst particles in a semi-circular section of each of said first and second riser conversion zones before effecting discharge thereof downwardly into the upper portion of a large separation and catalyst collection zone in open communication in the bottom thereof with a lower catalyst stripping zone, (g) withdrawing discharged separated vapors into cyclone separation zones radially displaced outside the lower locus of each riser downward discharge opening, (h) passing downwardly discharged separated catalyst through said stripping zone counter current to stripping gas thereafter recovered by said cyclones, (i) recovering hydrocarbon conversion products of said riser conversion zones from said cyclone separation zones, (j) passing the stripped catalyst through a sequence of separate riser regeneration zones maintained at a temperature above 1300°F. wherein the presence of steam in the first regeneration zone is sufficient to achieve a limiting combustion temperature level and the combustion of residual carbon on partially regenerated catalyst is accomplished in a second riser regeneration zone with oxygen containing gas in the absence of steam at a temperature above the temperature in the first riser regeneration zone, and (k) passing regenerated catalyst at a temperature between 1400°and 1600°F. to each of said first and second riser hydrocarbon conversion zones.