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US 11,359,155 B2Granted
Use of a wax anti-settling additive in automotive fuel compositions
AssigneeShell USA, Inc.
InventorsMark Lawrence Brewer, Nicholas James Rounthwaite, Michael Alan Parkes, Tushar Bera
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Abstract
Use of a wax anti-settling agent (WASA), in an automotive fuel composition, for the purpose of improving the acceleration performance of an internal combustion engine into which the fuel composition is or is intended to be introduced or of a vehicle powered by such an engine.
Claims12
A method for improving an acceleration performance of an internal combustion engine, the method comprising:
- combusting an automotive diesel fuel composition in an internal combustion engine,
- the automotive diesel fuel composition comprising:
- a wax anti-settling agent (WASA);
- and
- a middle distillate flow improver (MDFI),
- wherein the wax anti-settling agent comprises an oil-soluble polar nitrogen compound in the form of a quaternary ammonium salt of a carboxylic acid wherein the quaternary ammonium salt of a carboxylic acid has the formula [NR2R13R14]X wherein R represents a methyl, ethyl or propyl group;
- R13 represents a hydrocarbyl group containing from 8 to 40 carbon atoms, and R14 represents a hydrocarbyl group containing up to 40 carbon atoms;
- and X represents a monovalent carboxylate anion,
- wherein the MDFI comprises one or more of a vinyl acetate-containing compound, a vinyl acetate-containing polymer, and a copolymer of alkenes and unsaturated esters,
- wherein the concentration of the wax anti-settling agent in the automotive diesel fuel composition is in the range from 100 ppm to 500 ppm by weight of the automotive diesel fuel composition, and
- wherein the MDFI additive is present at a level of from 100 ppm to 500 ppm, by weight of the automotive diesel fuel composition.
8 more elements
Dependencies are inferred from the claim text.