Process having improved base oil yield
AssigneeChevron U.S.A. Inc.
InventorsKenny Peinado, Jifei Jia, Guan-Dao Lei, Jay Parekh, Yihua Zhang
Life of this patent
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Abstract
Provided is a process for preparing base oil from a waxy hydrocarbon feedstock by contacting the hydrocarbon feedstock in a hydroisomerization zone under hydroisomerization conditions. The reaction is in the presence of hydrogen and an inert gas, with the total pressure in the hydroisomerization zone being at least 400 psig. A product from the hydroisomerization zone is collected and separated into base oil products and fuel products. The inert gas can comprise any suitable inert gas, but is generally nitrogen, methane or argon. Nitrogen is used in one embodiment.
Claims29
A process for preparing base oil from a waxy hydrocarbon feedstock comprising:
- a) contacting the hydrocarbon feedstock in a hydroisomerization zone under hydroisomerization conditions in the presence of hydrogen and an inert gas, with total pressure in the zone where the total pressure ranges from 750 psig to 2500 psig and the volume ratio of hydrogen to inert gas ranging from 0.1 to 9.0;
- and
- b) collecting a product from the hydroisomerization in a), and passing the product to a hydrofinishing reactor;
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- c) collecting a product from the hydrofinishing reactor and separating the product into base oil products and fuel products with the base oil products being recovered, and with the recovered base oil yield being increased relative to using only hydrogen in the hydroisomerization zone.
A process for preparing base oil from a waxy hydrocarbon feedstock comprising:
- a) hydrotreating the waxy hydrocarbon feedstock;
- b) contacting the hydrotreated waxy hydrocarbon feedstock in a hydroisomerization zone under hydroisomerization conditions in the presence of hydrogen and an inert gas, with total pressure in the zone at least 400 psig and the volume ratio of hydrogen to inert gas ranging from 0.1 to 9.0;
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- c) collecting a product from the hydroisomerization in b), and passing the product to a hydrofinishing reactor;
- and
- d) collecting a product from the hydrofinishing reactor and separating the product into base oil products and fuel products with the base oil products being recovered, and with the recovered base oil yield being increased relative to using only hydrogen in the hydroisomerization zone.
Dependencies are inferred from the claim text.