Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion
Reexamination Certificate
2011-05-03
2011-05-03
Hill, Jr., Robert J (Department: 1774)
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Plural serial stages of chemical conversion
C208S057000, C208S058000
Reexamination Certificate
active
07935243
ABSTRACT:
Systems and methods for hydroprocessing a heavy oil feedstock with reduced heavy oil deposits, the system employs a plurality of contacting zones and separation zones zone under hydrocracking conditions to convert at least a portion of the heavy oil feedstock to lower boiling hydrocarbons, forming upgraded products, wherein the first contacting zone is operated at a temperature of at least 10° F. lower than a next contacting zone. The contacting zones operate under hydrocracking conditions, employing a slurry catalyst for upgrading the heavy oil feedstock, forming upgraded products of lower boiling hydrocarbons. In the separation zones, upgraded products are removed overhead and, optionally, further treated in an in-line hydrotreater. At least a portion of the non-volatile fractions recovered from at least one of the separation zones is recycled back to the first contacting zone in the system.
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Brennan Vivion Andrew
Chabot Julie
Kou Bo
Maris Erin
Yang Shuwu
Chevron U.S.A. Inc.
Hill, Jr. Robert J
McCaig Brian
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