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US 5,290,325 AGranted
Hydrocarbon fuel composition containing alpha-ketocarboxylate additive
AssigneeUnion Oil Company of California
InventorsDiane D. Kanne, William M. Fruscella
Life of this patent
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Abstract
Hydrocarbon fuels, especially diesel fuel compositions, contain alpha-ketocarboxylate additives such as methyl pyruvate to reduce particulate emissions therefrom when combusted in an internal combustion engine. The additives are preferably non-aromatic and metals-free.
Claims40
A composition comprising:
- a hydrocarbon fuel;
- and
- a sufficient amount of an alpha-ketocarboxylate ester additive to reduce particulate emissions from the combustion of the fuel.
A composition comprising:
- (a) a middle distillate hydrocarbon fuel;
- and
- (b) from about 0.1 to about 49.9 weight percent of a metal-free and non-aromatic additive based on the total weight of the composition, said additive comprising an alpha-ketocarboxylate ester having from 4 to about 40 carbon atoms, the composition having the property of releasing fewer particulates upon combustion than would the fuel without the additive.
A composition comprising:
- a hydrocarbon fuel;
- and
- the reaction product of an alpha-ketocarboxylic acid and an alcohol.
A composition comprising:
- a liquid hydrocarbon fuel;
- an alpha-ketocarboxylate ester;
- and
- a dissolved alcohol in a proportion greater than that soluble in the fuel in the absence of the alpha-ketocarboxylate.
1 more element
Dependencies are inferred from the claim text.