Mineral oils: processes and products – Chemical conversion of hydrocarbons – With subsequent treatment of products
Patent
1989-07-19
1990-09-04
Myers, Helane
Mineral oils: processes and products
Chemical conversion of hydrocarbons
With subsequent treatment of products
208 48R, 208111, 208310R, 208310Z, 208100, 208102, C10G 6706, C10G 2503
Patent
active
049542427
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 convert a substantial portion of the feedstock to lower boiling hydrocarbon products; (b) partially condensing the hydrocarbon effluent from the hydrocracking zone to produce a gaseous hydrocarbon stream comprising hydrogen, and an unconverted hydrocarbon stream having components boiling above about 400.degree. F. (204.degree. C.) and comprising trace quantities of 11.sup.+ ring heavy polynuclear aromatic compounds; (c) partially condensing at least a portion of the gaseous hydrocarbon stream comprising hydrogen recovered in step (b) to produce a hydrogen-rich gaseous stream and a liquid stream comprising lower boiling hydrocarbon products; (d) contacting at least a portion of the unconverted hydrocarbon stream having components boiling above about 400.degree. F. (204.degree. C.) and comprising trace quantities of 11.sup.+ ring heavy polynuclear aromatic compounds recovered in step (b) with an adsorbent in an adsorption zone which selectively retains the 11.sup.+ ring heavy polynuclear aromatic compounds to produce an unconverted hydrocarbon stream having components boiling above about 400.degree. F. (204.degree. C.) and having a reduced concentration of 11.sup.+ ring heavy polynuclear aromatic compounds; (e) introducing at least a portion of the unconverted hydrocarbon stream having components boiling above about 400.degree. F. (204.degree. C.) and having a reduced concentration of 11.sup.+ ring heavy polynuclear aromatic compounds resulting from step (d) and the liquid stream recovered from step (c) into a separation zone to produce a stream of lower boiling hydrocarbon products and a stream of unconverted hydrocarbonaceous compounds boiling above about 400.degree. F. (204.degree. C.); and (f) recycling at least a portion of the stream of unconverted hydrocarbonaceous compounds boiling above about 400.degree. F. (204.degree. C.) recovered in step (e) and at least a portion of the unconverted hydrocarbon stream having components boiling above about 400.degree. F. (204.degree. C.) and having a reduced concentration of 11.sup.+ ring heavy polynuclear aromatic compounds resulting from step (d) to the hydrocracking zone as at least a portion of the liquid recycle stream.
REFERENCES:
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patent: 3619407 (1971-11-01), Attane
patent: 4447315 (1984-05-01), Lamb et al.
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patent: 4698146 (1987-10-01), Gruia
patent: 4775460 (1988-10-01), Reno
Cutts, Jr. John G.
McBride Thomas K.
Myers Helane
Tolomei John G.
UOP
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