Trialkymethane mixtures as synthetic lubricants
AssigneeMobil Oil Corporation
InventorThomas R. Forbus, Jr.
Life of this patent
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Abstract
When different trialkyl methanes containing 25 through 36 carbon atoms are mixed the mixture exhibits surprisingly superior lubricant properties including low viscosity, high VI, low volatility, very low pour point and a dynamic viscosity at low temperatures that is less than those of PAO lubricants. Statistically predictable mixture compositions of mixed trialkyl methanes are prepared by reaction of mixtures of n-alkyl organometallic compounds with mixed aliphatic esters or equivalent compounds.
Claims10
A synthetic hydrocarbon lubricant fluid comprising a mixture of mixed tri-n-alkyl methane compounds each having a carbon number between 25 and 36 wherein the alkyl groups comprise C.sub.2 -C.sub.14 normal alkyl groups and the fluid mixture exhibits a kinematic viscosity of less than 5 at 100.degree. C., a viscosity index of at least 130, pour point below -30.degree. C. and a NOACK volatility of less than 18% weight loss.
A process for the production of a synthetic lubricate fluid having superior low temperature lubricant performance properties comprising:
- reacting a mixture of between 2 and 20 normal C.sub.2 -C.sub.14 alkyl organometallic compounds in aliphatic ether solution by carbonyl addition to at least one lower alkyl ester of a C.sub.2 -C.sub.14 linear aliphatic carboxylic acid in a mole ratio of 2 moles of said compounds to 1 mole of ester(s);
- treating the reaction product with water and separating a mixture of tri-n-alkyl carbinols;
- hydrogenating the carbinol mixture and recovering the saturated hydrocarbon hydrogenation product of a mixture of mixed normal trialkyl methanes comprising the synthetic lubricant fluid.
Dependencies are inferred from the claim text.