Hydrocracking process
AssigneeUop LLC
InventorsPaul R. Lamb, Steve T. Bakas, Brian M. Wood
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Abstract
A method is disclosed for hydrocracking a hydrocarbon feedstock having a propensity to form polynuclear aromatic compounds without excessively fouling the processing unit. The hydrocracking method includes contacting the hydrocarbon feedstock with a crystalline zeolite hydrocracking catalyst, contacting at least a portion of the resulting unconverted hydrocarbon oil containing polynuclear aromatic compounds with an adsorbent which selectively retains polynuclear aromatic compounds and recycling unconverted hydrocarbon oil having a reduced concentration of polynuclear aromatic compounds to the hydrocracking zone.
Claims8
A catalytic hydrocracking process which comprises:
- (a) contacting a hydrocarbon feedstock having a propensity to form polynuclear aromatic (PNA) compounds in a hydrocracking zone with added hydrogen and a metal promoted crystalline zeolite hydrocracking catalyst at elevated temperature and pressure sufficient to give a substantial conversion to lower boiling products;
- (b) condensing the hydrocarbon effluent from said hydrocracking zone and separating the same into a low boiling hydrocarbon product and unconverted hydrocarbon oil boiling above about 650.degree. F. and containing trace quantities of polynuclear aromatic compounds:
- (c) contacting at least a portion of said unconverted hydrocarbon oil containing polynuclear aromatic compounds with an adsorbent which selectively retains said polynuclear aromatic compounds;
- and
- (d) recycling unconverted hydrocarbon oil having a reduced concentration of polynuclear aromatic compounds resulting from step (c) to said hydrocracking zone.
Dependencies are inferred from the claim text.