US 10,377,959 B2 · High octane unleaded aviation fuel

Abstract

Unleaded aviation gasoline. An unleaded aviation gasoline includes a blend of high octane alkylate, an effective amount of selected alkyl benzenes, and selected aromatic amines sufficient to improve the functional engine performance to avoid harmful detonation sufficient to meet or exceed selected standards for detonation performance requirements in full scale aircraft piston spark ignition engines designed for use with Grade 100LL avgas. Suitable alkylated benzenes may include a mixture of xylene isomers. Selected aromatic amines, such as N-methyl-p-toluidine, are used to increase performance. The high octane alkylate may be an aviation alkylate, or iso-octane, or both, and may utilize high octane alkylates having a motor octane number of between about ninety-seven (97) and about one hundred (100). Suitable amounts of iso-pentane, n-butane, and iso-butane may be used for providing vapor pressure in a commercially acceptable range.

Claims43

Dependent claims

A high octane unleaded aviation gasoline composition, comprising:

(a) about forty-five percent (45%) to about sixty-five percent (65%) by weight of high octane alkylate having a motor octane number of between ninety-five (95) and one hundred (100);
(b) about ten percent (10%) to about thirty-five percent (35%) by weight of one or more alkalyated benzenes;
(c) about six percent (6%) to about twelve percent (12%) by weight, collectively, of a selected composition of one or more of iso-pentane, n-butane, and iso-butane, wherein the constituent(s) of said selected composition are sufficient that said high octane unleaded aviation gasoline composition has a vapor pressure of between 38 kPa and 49 kPa (between 5.51 pounds per square inch and 7.11 pounds per square inch);
and
(d) about four percent (4%) to about fifteen percent (15%) by weight aromatic amine(s), said aromatic amine(s) comprising (i) N-methyl-p-toluidine, and (ii) N-methyl-m-toluidine or m-toluidine or the combination thereof, in the ratio of between about four to one (4:1) (i) to (ii) and about twelve to one (12:1) (i) to (ii), by weight.

2 more elements

Dependencies are inferred from the claim text.

High octane unleaded aviation fuel

Life of this patent

High octane unleaded aviation fuel

Life of this patent

Abstract

Claims43