Mineral oils: processes and products – Chemical conversion of hydrocarbons – With subsequent treatment of products
Reexamination Certificate
2005-11-08
2005-11-08
Griffin, Walter D. (Department: 1764)
Mineral oils: processes and products
Chemical conversion of hydrocarbons
With subsequent treatment of products
C208S027000, C208S096000, C208S950000
Reexamination Certificate
active
06962651
ABSTRACT:
A method for producing lubricant base oils is provided comprising the steps of: (a) hydroisomerizing a feedstock over a medium pore size molecular sieve catalyst under hydroisomerization conditions to produce an isomerized product having a pour point of greater than a target pour point of the lubricant base oils; (b) separating the isomerized product into at least a light lubricant base oil having a pour point less than or equal to the target pour point of the lubricant base oils and a heavy fraction having a pour point of equal to or greater than the target pour point of the lubricant base oils and a cloud point greater than the target cloud point of the lubricant base oils; and (c) dehazing the heavy fraction to provide a heavy lubricant base oil having a pour point less than or equal to the target pour point of the lubricant base oils and a cloud point less than or equal to the target cloud point of the lubricant base oils.
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Miller Stephen J.
Rosenbaum John M.
Burns Doane Swecker & Mathis L.L.P.
Chevron U.S.A. Inc.
Griffin Walter D.
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