초록 ▼

The present disclosure is directed to a hydrocarbyl-substituted succinimide lubricity additive or a hydrocarbyl-substituted succinamide lubricity additive for low sulfur diesel fuel. The additive is derived from an olefin having little to no terminal double bonds and a very high proportion of intern

The present disclosure is directed to a hydrocarbyl-substituted succinimide lubricity additive or a hydrocarbyl-substituted succinamide lubricity additive for low sulfur diesel fuel. The additive is derived from an olefin having little to no terminal double bonds and a very high proportion of internal double bonds. The succinimide or succinamide is made by combining the alkylated succinic anhydride with ammonia. Also provided is a method for reducing wear scarring in a compression ignition engine comprising providing to the engine a middle distillate fuel comprising an effective amount of the hydrocarbyl-substituted succinimide and/or hydrocarbyl-substituted succinamide. A method for reducing an average coefficient of friction of a middle distillate fuel in a compression ignition engine comprising providing to the engine the disclosed fuel is also disclosed. Moreover, there is disclosed a method for improving the average film thickness from the combustion of a middle distillate fuel in a compression ignition engine.

대표청구항 ▼

1. A fuel composition comprising a major proportion of a middle distillate fuel and a minor proportion of a lubricity additive said additive comprising a hydrocarbyl-substituted succinimide prepared by combining an olefin and maleic anhydride to form a hydrocarbyl-substituted succinic anhydride and

1. A fuel composition comprising a major proportion of a middle distillate fuel and a minor proportion of a lubricity additive said additive comprising a hydrocarbyl-substituted succinimide prepared by combining an olefin and maleic anhydride to form a hydrocarbyl-substituted succinic anhydride and combining said hydrocarbyl-substituted succinic anhydride with ammonia to produce a hydrocarbyl-substituted succinimide, wherein the olefin is selected from the group consisting of (a) a mixture of oligomers, wherein the percentage of internal olefin oligomer is greater than 50% of the total olefin content; (b) a mixture of isobutylene oligomers; and (c) combinations thereof;wherein the olefin comprises a number average molecular weight of from about 150 to about 275; andwherein the lubricity additive is present in the fuel composition in an amount ranging from about 20 to about 300 ppm. 2. The fuel composition of claim 1, wherein the olefin has less than 10% terminal double bonds. 3. The fuel composition of claim 1, wherein the olefin comprises a blend of isobutylene oligomers. 4. The fuel composition of claim 1, wherein the olefin comprises a blend of C15-C18 internal olefins. 5. A method for reducing wear scarring in a compression ignition engine comprising: providing to the engine the fuel composition of claim 1. 6. The method of claim 5, wherein the olefin comprises a blend of isobutylene oligomers. 7. The method of claim 5, wherein the olefin comprises a blend of C15-C18 internal olefins. 8. The method of claim 5, wherein the wear scar of the fuel comprising the lubricity additive of claim 1 is less than 500 microns in the HFRR test of ASTM D 6079. 9. A method for reducing an average coefficient of friction of a middle distillate fuel in a compression ignition engine comprising: providing to the engine the fuel composition of claim 1. 10. A method for increasing the average film thickness of a middle distillate fuel in a compression ignition engine comprising: providing to the engine the fuel composition of claim 1. 11. A method for improving fuel economy of an engine combusting middle distillate fuel comprising: combusting in said engine the fuel composition of claim 1. 12. The fuel composition of claim 1, wherein the olefin comprises a mixture of isobutylene oligomers and internal olefins. 13. The method of claim 5, wherein the olefin comprises a mixture of isobutylene oligomers and internal olefins.