Leaded aviation gasoline
AssigneeExxonMobil Research and Engineering Company
InventorsRoger Grant Gaughan, William S. Blazowski, Daniel Dawson Lowrey, Thomas Mack Bell
Life of this patent
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Abstract
Aviation gasolines having an enhanced peak indicated mean effective pressure are provided by admixing with a leaded base aviation gasoline an aromatic amine of the formula NH2—Ar—(R1)n wherein R1 is selected from C1-C10 alkyl, halogen, and mixtures thereof provided that when R1 is alkyl it occupies the meta- or para-positions on the aromatic ring, Ar is a phenyl aromatic group and n is an integer from 0 to 3 to provide an aviation gasoline having a peak indicated mean effective pressure as determined by ASTM D-909 of greater than about 200 psi.
Claims11
An improved leaded aviation fuel composition for piston driven aircraft which comprises:
- (1) an aviation gasoline base fuel having an unleaded MON of at least about 90 and containing between about 0.013 to 0.6 grams lead per liter of gasoline base fuel from a lead-containing octane improver, and
- (2) 0.08 to 0.40 wt % of at least one aromatic amine effective to boost the peak indicated mean effective pressure as measured by ASTM D909 by at least 1 psi above the PIMEP of the leaded but unaminated base fuel, said aromatic amine having the formula NH2—Ar—(R1)n wherein R1 is C1-C10 alkyl, Ar is a phenyl group and n is an integer from 0 to 3 with the proviso that R1 is positioned in the meta- or para-position(s) on the aromatic ring, wherein the resulting aviation fuel composition has a peak indicated means effective pressure (PIMEP) as measured by ASTM D909 greater than about 210 psi.
A leaded aminated aviation fuel composition having a peak indicated mean effective pressure as measured by ASTM D909 of greater than about 200 psi for piston driven aircraft which comprises:
- (1) an aviation gasoline base fuel having an unleaded MON of 91 to 95 and containing between about 0.013 to 0.6 grams lead per liter of gasoline base fuel of tetraethyl lead as octane improver, and
- (2) 0.08 to 0.40 wt % of at least one aromatic amine effective to boost the peak indicated mean effective pressure of the leaded base fuel by at least 1 psi above the PIMEP of the leaded fuel prior to the addition of the amine, said aromatic amine being of the formula NH2—Ar—(R1)n wherein R1 is halogen or a combination of halogen and C1-C10 alkyl with the proviso that the alkyl group is positioned at the meta- or para-position(s) on the aromatic ring.
A method for a increasing the peak indicated mean effective pressure of leaded aviation fuel composition to about 200 psi for use in piston driven aircraft which comprises admixing with an aviation base fuel having a MON of at least 90, an amount of tetraethyl lead between about 0.013 to about 0.6 grams lead per liter of base fuel, and from about 0.08 to 0.40 wt % of one or more aromatic amines of the formula NH2—Ar—(R1)n where R1 is selected from the group consisting of C1-C10 alkyl, halogen and mixtures thereof, Ar is a phenyl group and n is an integer from 0 to 3 with the proviso that when R1 is alkyl it is positioned in the meta- and/or para-position(s) on the aromatic ring effective to boost the peak indicated mean effective pressure of the leaded base fuel at least 1 psi above the PIMEP of the leaded fuel prior to the addition of the amine.
A method for operating a piston driven aircraft at high fuel-air ratios with a leaded fuel which comprises operating the piston driven aircraft with a leaded aminated aviation gasoline base fuel having a peak indicated mean effective pressure of greater than about 200 psi containing between about 0.013 to 0.6 grams of lead per liter of gasoline base fuel of TEL and from about 0.08 to 0.40 wt % of one or more aromatic amines of the formula NH2—Ar—(R1)n where K1 is selected from the group consisting of C1-C10 alkyl, halogen and mixtures thereof, Ar is a phenyl group and n is an integer from 0 to 3 with the proviso that when R1 is alkyl it is positioned in the meta- and/or para-position(s) on the aromatic ring effective to boost the peak indicated mean effective pressure of the leaded base fuel at least 1 psi above the PIMEP of the leaded fuel prior to the addition of the amine, the leaded aviation gasoline fuel containing the aromatic amine having a motor octane number of at least 100.
Dependencies are inferred from the claim text.