Mineral oils: processes and products – Products and compositions – Lubricating oils
Reexamination Certificate
2005-04-20
2009-08-25
Griffin, Walter D (Department: 1797)
Mineral oils: processes and products
Products and compositions
Lubricating oils
C208S024000, C208S046000, C208S058000, C208S061000, C208S133000, C208S950000, C518S726000, C585S258000, C585S259000, C585S266000, C585S329000
Reexamination Certificate
active
07578926
ABSTRACT:
A process for producing a lubricating base oil having high oxidation stability, wherein the feed used to prepare the lubricating base oil contains at least 5 wt. % olefins, said process comprising (a) determining the weight percent of olefins present in the feed by means of1H NMR; (b) hydroprocessing the feed under hydroprocessing conditions selected to reduce the amount of olefins present to a target value which has been pre-determined by means of1H NMR to produce a lubricating base oil having the desired oxidation stability; and (c) collecting a lubricating base oil having the selected oxidation stability from the hydroprocessing zone.
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Abernathy Susan M.
Johnson David R.
Rosenbaum John M.
Young Don
Abernathy Susan M.
Chevron U.S.A. Inc.
Griffin Walter D
Nguyen Huy-Tram
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