Diesel fuel additive
AssigneeAfton Chemical Corporation
InventorsXinggao Fang, Julie Galante-Fox
Life of this patent
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Abstract
A diesel fuel additive composition, a fuel containing the fuel additive, a method for improving diesel engine performance using the additive and a method for making the additive for diesel engines having a high pressure fuel injection system. The fuel additive has a number average molecular weight (Mn) of from about 500 to about 10,000 and is selected from a hydrocarbyl-substituted succinic acid or anhydride or derivative thereof and a hydrocarbyl-substituted Mannich base. The additive has a molecular weight distribution such that less than about 25 wt. % of the additive has a molecular weight of 400 or less as measured by gel permeation chromatography (GPC) based on a polystyrene calibration curve.
Claims7
A diesel fuel additive composition comprising:
- a diesel fuel additive having a number average molecular weight of from about 500 to about 10,000 and being selected from a hydrocarbyl-substituted acid or anhydride or derivative thereof, wherein the additive has been treated to remove components of the additive having a molecular weight of 400 or less so that the additive has a molecular weight distribution wherein from about 1.4 to about 5 wt. % of the additive has a molecular weight of 400 or less as measured by gel permeation chromatography (GPC) based on a polystyrene calibration curve.
A method for reducing the occurrence of injector sticking in a high pressure diesel fuel injection system in a diesel engine having injectors and combusting a diesel fuel containing 15 ppm by weight or less sulfur, said method comprising combusting in said engine a composition comprising said diesel fuel and a diesel fuel additive having a number average molecular (Mn) weight of from about 500 to and 10,000 and being selected from a hydrocarbyl-substituted succinic acid or anhydride or derivative thereof, wherein the additive has been treated to remove components of the additive having a molecular weight of 400 or less so that the additive has a molecular weight distribution wherein from about 1.4 to about 5 wt. % of the additive has a molecular weight of 400 or less as measured by gel permeation chromatography, whereby the occurrence of injector sticking is reduced relative to the occurrence of injector sticking in a comparable engine combusting fuel comprising a fuel additive having a molecular weight distribution such that more than 5 wt. % of the fuel additive has a molecular weight of 400 or less as measured by gel permeation chromatography (GPC) based on a polystyrene calibration curve.
Dependencies are inferred from the claim text.