Multifunctional additives to improve the low-temperature properties of distillate fuels and compositions thereof
AssigneeMobil Oil Corporation
InventorsDavid J. Baillargeon, Angeline B. Cardis, Dale B. Heck
Life of this patent
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Abstract
Additives which improve the low-temperature properties of distillate fuels are the reaction products of (1) diols, and (2) the product of pyromellitic dianhydride and aminoalcohols and amines with long-chain hydrocarbyl groups attached.
Claims24
A liquid hydrocarbyl fuel oligomer/polymer additive product of reaction obtained by reacting in differing ratios (1) a secondary amine and a mixture of at least two different epoxides wherein one is selected from saturated or unsaturated C.sub.8 to C.sub.30 epoxides and the other is selected from C.sub.2 to C.sub.100 epoxides and thereafter (2) reacting the product of (1) with pyromellitic dianhydride or its acid equivalent and (3) reacting the resultant reactive acid/anhydride with a hydrocarbyl diol or a polyhydrocarbyl diol under conditions sufficient to obtain esterification wherein said differing ratios are less than molar ratios, molar ratios and more than molar ratios and where the temperature of reaction varies from about 150.degree. C. to 200.degree. C., at pressures of from about 0.001 arm to about 1 atm with reaction times varying from about one to about 48 hours.
A fuel composition comprising a major amount of a liquid hydrocathybyl fuel and a minor amount of from about 0.001 to about 10 wt. % based on the total weight of the composition of an oligomer/polymer additive product of reaction obtained by reacting in differing ratios (1) a secondary amine and a mixture of at least two different epoxides wherein one is selected from saturated or unsaturated C.sub.8 to C.sub.30 epoxides and the other is selected from C.sub.2 to C.sub.100 epoxides and thereafter (2) reacting the product of (1) with pyromellitic dianhydride or its acid equivalent and (3) reacting in situ the resultant reactive acid/anhydride with a hydrocarbyl diol or a polyhydrocarbyl diol under conditions sufficient to obtain esterification wherein said differing ratios are less than molar ratios, molar ratios and more than molar ratios and where the temperature of reaction varies from about 150.degree. C. to 200.degree. C., at pressures of from about 0.001 arm to about 1 arm with reaction times varying from about one to about 48 hours.
A process of preparing a liquid hydrocarbyl fuel oligomer/polymer additive product of reaction comprising reacting in differing ratios (1) a secondary amine and a mixture of at least two different epoxides wherein one is selected from saturated or unsaturated C.sub.8 to C.sub.30 epoxides and the other is selected from C.sub.2 to C.sub.100 epoxides and thereafter (2) reacting the product of (1) with pyromellitic dianhydride or its acid equivalent and (3) reacting the resultant reactive acid/anhydride with a hydrocarbyl diol or a polyhydrocarbyl diol under conditions sufficient to obtain esterification wherein said differing ratios are less than molar ratios, molar ratios and more than molar ratios and where the temperature of reaction varies from about 150.degree. C. to 200.degree. C., at pressures of from about 0.001 arm to about 1 atm with reaction times varying from about one to about 48 hours.
Dependencies are inferred from the claim text.