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US 4,627,908 AGranted
Process for stabilizing lube base stocks derived from bright stock
AssigneeChevron Research Company
InventorStephen J. Miller
Life of this patent
Estimating the term…
Abstract
A process for stabilizing a lubricating oil base stock derived from a nitro-aromatic-containing hydrocracked bright stock, comprising a two-step stabilizing process utilizing hydrodenitrification followed by mild hydrofinishing.
Claims14
An improved process for stabilizing a nitro-aromatic-containing lubricating oil base stock derived from a hydrocracked bright stock, comprising:
- (a) contacting said hydrocracked bright stock with hydrogen in the presence of a catalyst having hydrodenitrification activity under conditions effective to reduce the nitrogen content of said stock and to minimize cracking to produce a substantially nitrogen-free product;
- and
- (b) contacting said substantially nitrogen-free product with hydrogen in the presence of a catalyst having hydrogenation activity under mild conditions to produce a stabilized lubricating oil base stock having improved oxidation stability as shown by oxidator BN.
Dependencies are inferred from the claim text.