Method and composition for improving the combustion of aviation fuels
AssigneeAfton Chemical Corporation
InventorsStephen A. Factor, Zachary John McAfee, Joseph Anthony Calderone, III
Life of this patent
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Abstract
An aviation fuel is formulated with manganese-containing compounds. The composition may include relatively high amounts of manganese up to about 500 mg Mn/l. A manganese-containing additive may reduce the smoke created during the combustion of the aviation fuel. Additionally, the aviation fuel composition may include manganese to improve octane and include a phosphorus-containing scavenger to reduce manganese oxide engine deposits. Further, isooctane is added in order to, with the manganese-containing compound, improve the octane number of the fuel.
Claims23
An aviation fuel composition comprising:
- (a) from about 10 to about 80 volume percent of aviation alkylate;
- (b) from about 5 to 50 volume percent isooctane;
- (c) from about 5 to 20 volume percent of isopentane;
- (d) from about zero to about 30 volume percent of aromatic hydrocarbons;
- (e) from about 0.5 to 500 mg Mn/l of one or more cyclopentadienyl manganese tricarbonyl;
- and
- (f) a manganese scavenger compound, wherein the manganese scavenger compound comprises an aviation fuel soluble phosphorus-containing compound;
- wherein the composition is substantially lead-free, and the composition has a rating number of at least about 96 as determined by ASTM Test Method D 2700.
An aviation fuel additive composition comprising:
- (a) about 5 to about 50 volume percent isooctane and about 5 to about 20 volume percent isopentane;
- (b) one or more cyclopentadienyl manganese tricarbonyl;
- and
- (c) a manganese scavenger compound, wherein the manganese scavenger compound comprises a phosphorus-containing compound;
- wherein the additive is substantially lead-free.
A method of increasing the octane rating number of an aviation fuel comprising the steps of:
- providing a fuel additive composition comprising about 5 to about 50 volume percent isooctane, about 5 to about 20 percent isopentane, a cyclopentadienyl manganese tricarbonyl compound, and a manganese scavenger, wherein the manganese scavenger comprises a phosphorus-containing compound;
- adding the fuel additive composition to an aviation base fuel composition,
- wherein the resulting fuel composition has a rating number of at least about 98 as determined by ASTM Test Method D 2700.
Dependencies are inferred from the claim text.