Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion
Patent
1989-04-24
1990-05-01
McFarlane, Anthony
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Plural serial stages of chemical conversion
208 99, 208100, 208111, C10G 6510
Patent
active
049215957
ABSTRACT:
A catalytic hydrocracking process which comprises: (a) contacting a hydrocarbonaceous feedstock having a propensity to form 11.sup.+ ring heavy polynuclear aromatic compounds and a liquid recycle stream in a hydrocracking zone with added hydrogen and a metal promoted hydrocracking catalyst at elevated temperature and pressure sufficient to gain a substantial conversion to lower boiling products; (b) partially condensing the hydrocarbon effluent from the hydrocracking zone and separating the same into a lower boiling hydrocarbon product stream and an unconverted hydrocarbon stream boiling above about 400.degree. F. (204.degree. C.) and comprising trace quantities of 11.sup.+ ring heavy polynuclear aromatic compounds; (c) introducing at least a portion of the unconverted hydrocarbon stream boiling above about 400.degree. F. (204.degree. C.) and comprising trace quantities of 11.sup.+ ring heavy polynuclear aromatic compounds into a 11.sup.+ ring heavy polynuclear aromatic compound conversion zone containing a zeolitic hydrogenation catalyst having pore openings in the range from about 8 to about 15 Angstroms (10.sup.-10 meters) and a hydrogenation component operated at conditions to selectively reduce the concentration of 11.sup.+ ring heavy polynuclear aromatic compounds; (d) condensing at least a portion of the resulting effluent from the conversion zone to produce a liquid stream comprising hydrogenated hydrocarbonaceous compounds and having a reduced concentration of 11.sup.+ ring heavy polynuclear aromatic compounds; and (e) recycling at least a portion of the liquid stream comprising hydrogenated hydrocarbonaceous compounds recovered in step (d) to the hydrocracking zone in step (a) as at least a portion of the liquid recycle stream.
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Cutts, Jr. John G.
McBride Thomas K.
McFarlane Anthony
Tolomei John G.
UOP
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