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US 4,361,477 AGranted
Stabilizing and dewaxing lube oils
AssigneeChevron Research Company
InventorStephen J. Miller
Life of this patent
Estimating the term…
Abstract
A two-step process for dewaxing and stabilizing hydrocracked lubricating oil stocks is disclosed. High-silica zeolite produces catalytic dewaxer effluent containing lower olefins for favorable stabilizing (alkylation) reactions by contact with acidic catalyst substantially free of hydrogenation activity.
Claims7
A lubricating oil dewaxing and stabilizing process, comprising:
- (a) catalytically dewaxing a hydrocracked hydrocarbonaceous feedstock by contacting said feedstock with a catalyst which comprises an intermediate pore size zeolite, said zeolite having a silica-to-alumina mole ratio of greater than about 200:1 and being in the hydrogen form, to produce a dewaxed effluent which contains olefins;
- and
- (b) stabilizing at least part of said dewaxed effluent by contacting said part with a heterogeneous acidic catalyst which is substantially free of hydrogenation activity.
Dependencies are inferred from the claim text.