Lube base oils with improved yield
AssigneeChevron U.S.A. Inc.
InventorDennis J. O'Rear
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Abstract
The invention provides methods for preparing a blended lube base oils comprising at least one highly paraffinic Fischer Tropsch lube base stocks and at least one base stock composed of alkylaromatics, alkylcycloparaffins, or mixtures thereof. The use of base stocks composed of alkylaromatics, alkylcycloparaffins, or mixtures thereof improves the yield of lube base oils from Fischer Tropsch facilities, as well as provides moderate improvements in physical properties including additive solubility. The invention provides processes for obtaining such blended lube base oils using the products of Fischer Tropsch processes.
Claims21
A lubricant comprising:
- a) at least one highly paraffinic Fischer-Tropsch derived lube base stock having a viscosity of greater than 3 cSt when measured at 40° C., having a branching index of less than 5, and having an average length of alkyl side branches of less than 2 carbon atoms;
- and
- b) at least one lube base stock composing alkylaromatics, alkylcycloparaffins, or mixtures thereof and having a viscosity of greater than 2 cSt when measured at 40° C.;
- wherein the lubricant comprises component b) in an amount of from about 1 wt % to about 50 wt % and the lubricant has a viscosity of greater than 3 cSt when measured at 40° C.
A lubricant comprising:
- a) 99 to 75 weight % of a Fischer-Tropsch derived lube base stock comprising more than 90 weight % paraffins and having a viscosity of greater than 3 cSt when measured at 40° C.;
- and
- b) 25 to 1 weight % of a Fischer-Tropsch derived lube base stock comprising ≧50 weight % alkylaromatics, alkylcycloparaffins, or mixtures thereof and having a viscosity of greater than 2 cSt when measured at 40° C.;
- and
- wherein the lubricant has a viscosity of greater than 3 cSt when measured at 40° C., a viscosity index of greater than 80, a pour point of less than 10° F., and a sulfur content of less than 100 ppm.
A lubricant comprising:
- a) a Fischer-Tropsch derived lube base stock comprising more than 90 weight % paraffins and having a viscosity of greater than 3 cSt when measured at 40° C., a branching index of less than 5, an average length of alkyl side branches of less than 2 carbon atoms, and an initial boiling point greater than 450° F.;
- b) a Fischer-Tropsch derived lube base stock comprising ≧50 weight % alkylaromatics, alkylcycloparaffins, or mixtures thereof and having a viscosity of greater than 2 cSt when measured at 40° C.;
- and
- c) an effective amount of a synthetic ester co-solvent to reduce turbidity of the lubricant to below two NTUs, wherein the effective amount of synthetic ester co-solvent is less than would be required in component a) alone;
- wherein the lubricant comprises component b) in an amount of from about 1 wt % to about 25 wt % and the lubricant has a viscosity of greater than 3 cSt when measured at 40° C., a viscosity index of greater than 80, a pour point of less than 10° F., and a sulfur content of less than 100 ppm.
Dependencies are inferred from the claim text.