Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion
Patent
1987-08-27
1989-03-21
Caldarola, Glenn
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Plural serial stages of chemical conversion
208131, 208 55, C10G 6906, C10G 6910
Patent
active
048140643
ABSTRACT:
A process for the conversion of an aromatic-rich, residual hydrocarbonaceous charge stock which possesses an aromatic hydrocarbon concentration greater than about 20 volume percent to selectively produce large quantities of high quality middle distillate while minimizing hydrogen consumption which process comprises the steps of: (a) reacting at least a portion of the residual hydrocarbonaceous charge stock and a hereinafter-described paraffin-rich, distillable hydrocarbonaceous stream boiling at a temperature greater than about 700.degree. F. (371.degree. C.) in a thermal coking zone at mild thermal coking conditions selected to provide thermal coking zone effluent rich in middle distillate; (b) separating the thermal coking zone effluent to provide a middle distillate fraction boiling in the range from about 300.degree. F. (149.degree. C.) to about 700.degree. F. (371.degree. C.) and a distillate hydrocarbonaceous stream boiling at a temperature greater than about 700.degree. F. (371.degree. C.); (c) reacting at least a portion of the distillate hydrocarbonaceous stream boiling at a temperature greater than about 700.degree. F. (371.degree. C.) with hydrogen, in a catalytic hydrocracking reaction zone, at hydrocracking conditions to convert at least a portion of the distillate hydrocarbonaceous stream to lower-boiling hydrocarbonaceous products including middle distillate and to convert at least 10 volume percent of the aromatic hydrocarbon compounds contained in the distillate hydrocarbonaceous stream to provide an increased concentration of paraffin hydrocarbon compounds in the resulting hydrocracking reaction zone effluent; (d) separating the resulting hydrocracking reaction zone effluent to provide a middle distillate product stream and a distillable paraffin-rich hydrocarbonaceous stream boiling at a temperature greater than about 700.degree. F. (371.degree. C.); (e) recovering the middle distillate product stream; and (f) reacting the distillable paraffin-rich hydrocarbonaceous stream boiling at a temperature greater than about 700.degree. F. (371.degree. C.) recovered in step (d) in the thermal coking zone of step (a).
REFERENCES:
patent: 3617511 (1969-04-01), Jenkins
patent: 4138325 (1979-02-01), Beutner et al.
patent: 4213846 (1980-07-01), Sooter et al.
patent: 4569751 (1986-02-01), Eide, Sr. et al.
patent: 4569752 (1986-02-01), Aldridge et al.
Chen Te-yu M.
Staggs Darrell W.
Stine Laurence O.
Caldarola Glenn
Cutts, Jr. John G.
McBride Thomas K.
Tolomei John G.
UOP Inc.
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