Mineral oils: processes and products – Chemical conversion of hydrocarbons – With subsequent treatment of products
Patent
1989-05-04
1990-06-05
Myers, Helane M.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
With subsequent treatment of products
208 48R, 208 56, 208 60, 208 82, 208 84, 208 86, 208102, 208103, 208104, 208105, 208108, 208143, 585266, C10G 1300, C10G 3700, C10G 4572
Patent
active
049311654
ABSTRACT:
A catalytic hydrocracking process which comprises: (a) contacting a hydrocarbonaceous feedstock having a propensity to form heavy polynuclear aromatic compounds and a liquid recycle stream in a hydrocracking zone to convert a substantial portion of the hydrocarbonaceous components in the feedstock to lower boiling products; (b) recovering a hydrocarbon effluent from the hydrocracking zone and 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 having at least a portion boiling above about 400.degree. F. (204.degree. C.) and comprising trace quantities of heavy polynuclear aromatic compounds; (c) introducing at least a portion of the unconverted hydrocarbon stream into a hydrogen stripping flash zone with a first hydrogen-rich gaseous stream having a temperature greater than the hydrocarbon stream at flash conditions thereby increasing the temperature of the hydrocarbon stream and vaporizing at least a portion thereof to produce a vapor stream comprising hydrogen and hydrocarbon compounds and produce a liquid hydrocarbon stream comprising heavy polynuclear aromatic compounds; (d) contacting the vapor stream comprising hydrogen and hydrocarbon compounds with a hydrogenation catalyst in a hydrogenation reaction zone to increase the hydrogen content of the hydrocarbon compounds contained in the vapor stream; (e) condensing at least a portion of the resulting effluent from the hydrogenation reaction zone to produce a second hydrogen-rich gaseous stream and a liquid stream comprising hydrogenated hydrocarbon compounds; and (f) recycling at least a portion of the liquid stream comprising hydrogenated hydrocarbon compounds recovered in step (e) to the hydrocracking zone in step (a).
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Cutts, Jr. John G.
McBride Thomas K.
Myers Helane M.
Tolomei John G.
UOP
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