Patent ID: 9163190
Filing Date: 2015-10-20
Classification: C10L

Abstract:
1. A method for improving the engine performance of a diesel engine having a high pressure fuel system comprising combusting in said engine a diesel fuel composition comprising a nitrogen-containing detergent and a performance enhancing additive, wherein the performance enhancing additive is the product of a Mannich reaction between: (a) formaldehyde; (b) a polyamine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexaethyleneheptamine, heptaethyleneoctamine, propane-1,2-diamine, 2(2-amino-ethylamino)ethanol and N (c) a phenol having one or more optionally substituted alkyl substituents; and wherein the nitrogen containing detergent is the reaction product of a poly(isobutene)-substituted succinic acid-derived acylating agent and a polyethylene polyamine, wherein the Mannich reaction product is present in an amount of from 0.1 to 100 ppm and the nitrogen containing detergent is present in an amount of from 1 to 200 ppm, wherein the diesel fuel has a sulphur content of at most 0.05% by weight, and wherein the engine has a pressure in excess of 1350 bar, and wherein the reaction product is obtained by reacting components (a), (b) and (c) in a molar ratio of 3:1:3 to 0.5:1:0.5; wherein the improvement in performance is measured by one or more of: a reduction in power loss of the engine; a reduction in deposits on the injectors of the engine; or a reduction in deposits in the vehicle fuel filter.