Process for stabilizing lube base stocks derived from bright stock
First Claim
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1. 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.
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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.
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14 Claims
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1. An improved process for stabilizing a nitro-aromatic-containing lubricating oil base stock derived from a hydrocracked bright stock, comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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