Diesel fuel compositions

Abstract

A diesel fuel composition having a mixture of a major portion of a hydrocarbon-based compression ignition fuel; and a minor portion of an additive having a polyalkylene succinimide dispersant, the dispersant being the reaction product of at least one amine and at least one polyalkylene succinic anhydride of formula I, wherein R 1 is a polyalkenyl radical having a number average molecular weight ranging from about 600 to about 850.

1 . A diesel fuel composition comprising a mixture of: 
 a major portion of a hydrocarbon-based compression ignition fuel; and    a minor portion of an additive comprising a polyalkylene succinimide dispersant, the dispersant being the reaction product of at least one amine and at least one polyalkylene succinic anhydride of formula I,                          wherein R 1  is a polyalkenyl radical having a number average molecular weight ranging from about 600 to about 850.    
     
     
         2 . The diesel fuel composition of  claim 1 , wherein the polyalkenyl radical comprises one or more polymer units chosen from linear or branched alkenyl radicals having about 2 to about 10 carbon atoms.  
     
     
         3 . The diesel fuel composition of  claim 1 , wherein the polyalkenyl radical comprises one or more linear or branched polymer units chosen from ethylene radicals, propylene radicals, butylene radicals, pentene radicals, hexene radicals, octene radicals and decene radicals.  
     
     
         4 . The diesel fuel composition of  claim 1 , wherein the polyalkenyl radical is a polyisobutylene radical.  
     
     
         5 . The diesel fuel composition of  claim 4 , wherein the polyalkenyl radical has a number average molecular weight ranging from about 700 to about 800.  
     
     
         6 . The diesel fuel composition of  claim 1 , wherein the at least one amine is a polyalkyleneamine.  
     
     
         7 . The diesel fuel composition of  claim 1 , wherein the at least one amine has the formula II,  
       
         
           
           
               
               
           
         
         wherein R 2  is a hydrogen atom, an alkyl group having from about 1 to about 6 carbon atoms; and  
         n is an integer ranging from 1 to 6.  
       
     
     
         8 . The diesel fuel composition of  claim 1 , wherein the at least one amine is a linear, branched or cyclic ethyleneamine chosen from ethylene diamine, propylene diamine, butylene diamine, diethylene triamine, triethylene tetraamine, tetraethylene pentamine, pentaethylene hexamine, dipropylene triamine, and tripropylene tetraamine.  
     
     
         9 . The diesel fuel composition of  claim 1 , wherein the at least one amine is a linear, branched or cyclic tetraethylene pentamine.  
     
     
         10 . The diesel fuel composition of  claim 1 , wherein the additive comprises at least one additional ingredient chosen from cetane improvers, corrosion inhibitors, cold flow improvers, pour point depressants, solvents, demulsifiers, lubricity additives, friction modifiers, amine stabilizers, combustion improvers, antioxidants, heat stabilizers, conductivity improvers, metal deactivators, organic nitrate ignition accelerators, cyclomatic manganese tricarbonyl compounds, and marker dyes.  
     
     
         11 . A diesel fuel additive, comprising: 
 a polyalkylene succinimide dispersant, the dispersant being the reaction product of at least one polyamine and at least one polyalkylene succinic anhydride of formula I,                          wherein R 1  is a polyalkenyl radical having a number average molecular weight ranging from about 600 to about 850.    
     
     
         12 . The diesel fuel additive of  claim 11 , wherein the polyalkenyl radical comprises one or more polymer units chosen from linear or branched alkenyl radicals having about 2 to about 10 carbon atoms.  
     
     
         13 . The diesel fuel additive of  claim 12 , wherein the polyalkenyl radical has a number average molecular weight ranging from about 700 to about 800.  
     
     
         14 . The diesel fuel additive of  claim 11 , wherein the at least one amine is a polyalkyleneamine.  
     
     
         15 . The diesel fuel additive of  claim 11 , wherein the polyalkenyl radical is a polyisobutylene radical, and the at least one amine is a linear, branched or cyclic tetraethylene pentamine.  
     
     
         16 . The diesel fuel composition of  claim 11 , wherein the additive comprises at least one additional ingredient chosen from cetane improvers, corrosion inhibitors, cold flow improvers, pour point depressants, solvents, demulsifiers, lubricity additives, friction modifiers, amine stabilizers, combustion improvers, antioxidants, heat stabilizers, conductivity improvers, metal deactivators, organic nitrate ignition accelerators, cyclomatic manganese tricarbonyl compounds and marker dyes.  
     
     
         17 . A method for the production of a diesel fuel composition, the method comprising: 
 providing a major portion of a hydrocarbon-based compression ignition fuel; and    providing a minor portion of an additive comprising a polyalkylene succinimide dispersant, the dispersant being the reaction product of at least one polyamine and at least one polyalkylene succinic anhydride of formula I,                          wherein R 1  is a polyalkenyl radical having a number average molecular weight ranging from about 600 to about 850.    
     
     
         18 . The method of  claim 17 , wherein the polyalkenyl radical is a polyisobutylene radical having a number average molecular weight ranging from about 700 to about 800 and the at least one amine is a polyalkyleneamine.  
     
     
         19 . The method of  claim 17 , further comprising providing at least one additional ingredient chosen from cetane improvers, corrosion inhibitors, cold flow improvers, pour point depressants, solvents, demulsifiers, lubricity additives, friction modifiers, amine stabilizers, combustion improvers, antioxidants, heat stabilizers, conductivity improvers, metal deactivators, organic nitrate ignition accelerators, cyclomatic manganese tricarbonyl compounds and marker dyes.  
     
     
         20 . A method for reducing the amount of injector deposits in a diesel engine having at least one combustion chamber and one or more injectors in fluid connection with the combustion chamber, the method comprising: 
 injecting the hydrocarbon-based compression ignition fuel of  claim 1  through the injectors into the combustion chamber; and    igniting the combustion fuel.