Patent ID: 6238446
Filing Date: 2001-05-29
Classification: C10L

Abstract:
An unleaded aviation gasoline composition which comprises:(a) from 85 to 92 volume percent of aviation alkylate;(b) from 4 to 10 volume percent of at least one ether selected from methyl tertiary-butyl ether, ethyl tertiary-butyl ether, methyl tertiary-amyl ether, and mixtures of any two or all three of the foregoing ethers;(c) from zero to 10 volume percent of one or more other hydrocarbons falling in the aviation gasoline boiling range; and(d) from 0.25 to 0.6 gram of manganese per gallon as one or more cyclopentadienyl manganese tricarbonyl compounds;wherein the sum of the amounts of (a) and (b), and also of (c) if present, is 100 volume percent; with the proviso that (a), (b) and (d), and also (c) if present, are proportioned such that said composition has (i) an ASTM D 2382 heat of combustion of at least 18,000 BTU per pound, and (ii) a minimum knock value lean rating octane number of 100 as determined by ASTM Test Method D 2700 and wherein motor method octane ratings are converted to aviation ratings in the manner described in ASTM Specification D 910-90.