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Surfactant compositions suitable for the emulsification of methanol or ethanol in hydrocarbon liquids, especially diesel oil, consist of a blend of (i) from 10% to 90% by weight of block or graft copolymer in which one polymeric component is the residue of an oil-soluble complex monocarboxylic acid

Surfactant compositions suitable for the emulsification of methanol or ethanol in hydrocarbon liquids, especially diesel oil, consist of a blend of (i) from 10% to 90% by weight of block or graft copolymer in which one polymeric component is the residue of an oil-soluble complex monocarboxylic acid and another polymeric component is the residue of a water-soluble polyalkylene glycol or polyalkyleneoxy polyol and (ii) from 90% by 10% by weight of the salt of an aliphatic amino compound with a long-chain aliphatic carboxylic acid.

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A surfactant composition suitable for the emulsification of methanol or ethanol in a hydrocarbon liquid, the composition being a blend of: (i) from 10% to 90% by weight of a block or graft copolymer having the general formula (A－COO)m－B, wherein m is an integer at least 2, wherein each polymeric com

A surfactant composition suitable for the emulsification of methanol or ethanol in a hydrocarbon liquid, the composition being a blend of: (i) from 10% to 90% by weight of a block or graft copolymer having the general formula (A－COO)m－B, wherein m is an integer at least 2, wherein each polymeric component A has a molecular weight of at least 500 and is the residue of an oil-soluble complex monocarboxylic acid having the general structural formula [Figure] (I) in which R is hydrogen or a monovalent hydrocarbon or substituted hydrocarbon group; R1 is hydrogen or a monovalent C1 to C24 hydrocarbon group; R2 is a divalent C1 to C24 hydrocarbon group; n is zero or 1; p is an integer from zero up to 200; and wherein each polymeric component B has a molecular weight of at least 500 and, in the case where m is 2, is the divalent residue of a water-soluble polyalkylene glycol having the general formula [Figure] (II) in which R3 is hydrogen or a C1 to C3 alkyl group; q is an integer from 10 up to 500; or in the case where m is greater than 2, is the residue of valency m of a water-soluble polyether polyol having the general formula [Figure] (III) in which R3 and m have their previous significance; r is zero or an integer from 1 to 500, provided that the total number of [Figure] units in the molecule is at least 10; R4 is the residue of an organic compound containing in the molecule m hydrogen atoms reactive with an alkylene oxide; with (ii) from 90% to 10% by weight of the salt of an aliphatic amino compound with a long-chain aliphatic carboxylic acid. An emulsion of methanol or ethanol in a liquid hydrocarbon fuel, the emulsion containing from 1% to 75% by weight of methanol or ethanol as the disperse phase and from 25% to 99% by weight of the hydrocarbon fuel as the continuous phase, and in addition, as emulsifying agent, from 1% to 100% by weight, based on the disperse phase, of a surfactant composition as claimed in claim 1.