Patent ID: 7722688

Claim:
A water blended fuel composition made by combining: (i) a normally liquid hydrocarbon fuel; (ii) water; and (iii) a nitrogen-free surfactant comprising: (iii)(a) a nitrogen-free surfactant of a hydrocarbyl substituted carboxylic acid, or a reaction product of the hydrocarbyl substituted carboxylic acid or reactive equivalent of such acid with an alcohol, the hydrocarbyl substituent of the acid or reactive equivalent containing at least about 30 carbon atoms; and (iii)(b) a nitrogen-free surfactant of a at least one compound represented by one or more of the formulae: wherein the composition further comprises an acid having a pKa of about 1.5 up to about 6; and wherein each R is independently hydrogen or a hydrocarbyl group of up to about 60 carbon atoms; each R′ and R″ is independently an alkylene group of 1 to about 20 carbon atoms; each R′″ is independently hydrogen, or an acyl or hydrocarbyl group of up to about 30 carbon atoms; n is a number in the range of zero to about 50; and x, y and z are independently numbers in the range of zero to about 50 with the total for x, y and z being at least 1.