Use and method

Abstract

The use of a nitrogen containing detergent as an additive in a diesel fuel composition to reduce the impact of deposits in an EGR system of a diesel engine when combusting said diesel fuel composition.

1 . Use of one or more nitrogen containing detergent as an additive in a diesel fuel composition to reduce the impact of deposits in an exhaust gas recirculation system of a diesel engine when combusting said diesel fuel composition. 
     
     
         2 . A method of reducing the impact of deposits in an exhaust gas recirculation system of a diesel engine, the method comprising combusting in the engine a diesel fuel composition comprising as an additive one or more nitrogen containing detergent. 
     
     
         3 . The method of  claim 2  which reduces the formation of deposits in the exhaust gas recirculation system of a diesel engine. 
     
     
         4 . The method of  claim 2 , wherein the exhaust gas recirculation system is a high pressure exhaust gas recirculation system, wherein the high pressure EGR system is either a stand-alone high pressure EGR system or is part of a hybrid or a dedicated EGR system. 
     
     
         5 . The method of  claim 2 , wherein the additive is selected from:
 (a) a quaternary ammonium salt additive;   (b) the product of a Mannich reaction between an aldehyde, an amine and an optionally substituted phenol;   (c) the reaction product of a carboxylic acid-derived acylating agent and an amine; and   (d) mixtures thereof.   
     
     
         6 . The method of  claim 2 , wherein the diesel fuel composition comprises (a) a quaternary ammonium salt additive. 
     
     
         7 . The method of  claim 2 , wherein the diesel fuel composition comprises (b) the reaction product of a hydrocarbyl substituted acylated agent and an amine. 
     
     
         8 . The method of  claim 2 , wherein the diesel fuel composition comprises (c) the product of a Mannich reaction between an aldehyde, an amine and an optionally substituted phenol. 
     
     
         9 . The method of  claim 2 , wherein component (a) comprises a quaternary ammonium salt formed by reacting methyl salicylate, dimethyl oxalate or propylene oxide (optionally in combination with an acid) with the reaction product of a polyisobutylene-substituted succinic anhydride having a PIB molecular weight (Mn) of 700 to 1300 and dimethylaminopropylamine. 
     
     
         10 . The method of  claim 2 , wherein component (a) comprises a quaternary ammonium salt formed by reacting methyl salicylate, dimethyl oxalate or propylene oxide (optionally in combination with an acid) with the reaction product of a fatty acid of formula RCOOH in which R is an alkyl or alkenyl group having 12 to 24 carbon atoms, and a compound of formula (II), wherein both R 2  and R 3  are C 1  to C 4  alkyl groups and X is alkylene group having from 2 to 5 carbon atoms. 
     
     
         11 . The method of  claim 2 , wherein component (a) comprises a quaternary ammonium salt formed by reacting methyl salicylate, dimethyl oxalate or propylene oxide (optionally in combination with an acid) with a tertiary amine of formula R 5 R 6 R 7 N, wherein each of R 5 , R 6  and R 7  is independently an alkyl group or a hydroxyalkyl group. 
     
     
         12 . The method of  claim 2 , wherein component (b) comprises the reaction product of a polyisobutene-substituted succinic acid or succinic anhydride and a polyethylene polyamine selected from ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexaethylene-heptamine and mixtures and isomers thereof; wherein polyisobutene substituent has a number average molecular weight of between 500 and 2000. 
     
     
         13 . The method of  claim 2 , wherein component (c) comprises the reaction product of formaldehyde, a polyethylene polyamine and a para-substituted monoalkyl phenol. 
     
     
         14 . The method of  claim 2 , wherein the diesel fuel composition comprises from 1 to 1000 ppm of (a) a quaternary ammonium salt additive; and/or from 1 to 1000 ppm of (b) the reaction product of a carboxylic acid-derived acylating agent and an amine; and/or from 1 to 1000 ppm of (c) the product of a Mannich reaction between an aldehyde, an amine and an optionally substituted phenol. 
     
     
         15 . The method of  claim 2 , which reduces deposits in the exhaust gas recirculation system of a diesel engine having a pressure in excess of 1350 bar. 
     
     
         16 . The method of  claim 2 , which reduces the formation of deposits on a cooler of the exhaust gas recirculation system. 
     
     
         17 . The method of  claim 2 , wherein the diesel fuel composition comprises one or more nitrogen containing detergents. 
     
     
         18 . The method of  claim 2 , wherein the diesel engine is an off road engine. 
     
     
         19 . The method of  claim 2 , which provides one or more benefits selected from: an increase in power generation; an increase in torque; an increase in fuel economy; a reduction in emissions; a reduction in combustion chamber deposits; an acceleration improvement; driveability improvements; a reduction in cold start issues; lower soot formation; mitigation of lubricant degradation and/or performance loss; a reduction in diesel exhaust fluid and consumption; reduction in wear on all post combustion components; increased longevity of exhaust components; an increase in the maintenance period for the engine and/or post combustion components; and the protection of intake components downstream of the EGR.