Multiple zone catalytic cracking of hydrocarbons
AssigneeMobil Oil Corporation
InventorsMohsen N. Harandi, Hartley Owen
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Abstract
Methods for the fluidized catalytic cracking of plural hydrocarbon feedstocks in a riser reactor are disclosed. The processes generally comprises contacting a relatively light hydrocarbon feedstock in a first reaction zone with a first catalyst stream comprising spent catalyst, contacting a relatively heavy hydrocarbon feedstock in a second reaction zone with a second catalyst stream comprising freshly regenerated catalyst, and introducing at least a portion of the effluent from the first reaction zone into the second reaction zone. The first reaction zone and the second reaction zone preferably comprise first and second riser reaction zones, respectively.
Claims19
A process for the fluid catalytic cracking of at least two hydrocarbon feedstocks in the presence of finely divided solid catalytic cracking catalyst comprising a large pore size aluminosilicate zeolite selected from zeolite Y or zeolite USY, said process including the step of contacting a hydrocarbon feedstock with the cracking catalyst to produce cracked hydrocarbons and spent catalyst, comprising:
- (a) contacting a first hydrocarbon feedstock in a first reaction zone with a first catalyst stream comprising said spent catalyst;
- (b) contacting a second hydrocarbon feedstock in a second reaction zone with a catalyst stream comprising freshly regenerated zeolite Y or zeolite USY catalyst, said second hydrocarbon feedstock being a heavy hydrocarbon relative to said first hydrocarbon feedstock;
- and
- (c) introducing at least a portion of the effluent from said first reaction zone into said second reaction zone.
A method of cracking a heavy hydrocarbon feedstock and a light hydrocarbon feedstock in a riser reactor, the method producing spent catalyst and regenerated catalyst, the spent and regenation catalyst comprising a large pore size aluminosilicate zeolite cracking catalyst selected from zeolite Y or USY said method comprising:
- (a) contacting the light hydrocarbon feedstock with spent catalyst at an initial contact location in said riser;
- (b) passing a suspension comprising said light hydrocarbon feedstock and said spent catalyst through said riser;
- (c) introducing the heavy hydrocarbon feedstock into said suspension at a second location downstream of said initial contact location;
- and
- (d) introducing the regenerated catalyst into said suspension at a location in said riser downstream of said initial contact location.
Dependencies are inferred from the claim text.