Diesel fuel additive compositions for improvement of particulate traps

Abstract

A diesel fuel composition which improves the performance of diesel engine particulate exhaust traps comprising a diesel fuel containing a combination of 1-25 ppm of metal in the form of a metal salt additive and 100 to 500 ppm of an oil soluble nitrogen containing ashless detergent additive.

1 . An additive composition for diesel fuel oils for use in diesel engines equipped with particulate traps, the composition comprising a combination of from 1 to 25 ppm of metal in the form of a metal salt additive and 10 to 500 ppm of a nitrogen containing oil soluble ashless detergent additive.  
     
     
         2 . A diesel fuel composition comprising a diesel fuel including a combination of 1 to 25 ppm of metal in the form of a metal salt additive and 10 to 500 ppm of an oil soluble nitrogen containing ashless detergent additive, with the proviso that the fuel composition does not contain a metal salt composed of a mixture of one or more cerium fatty acid carboxylates and 50% or more cerium oxide, unless such mixture has been added to the fuel as part of an additive combination with an ashless detergent.  
     
     
         3 . A method of improving the operation of a diesel engine equipped with a trap for particulate exhaust emissions which comprises adding to the diesel fuel used in said engine a combination of 1 to 25 ppm metal in the form of a metal salt additive and 10 to 500 ppm of an oil soluble nitrogen containing ashless detergent additive.  
     
     
         4 . A stable solution or dispersion comprising 80 to 20% by weight of a solvent and 20 to 80% by weight of a metal salt and an ashless detergent in such amount so as to provide 1 to 25 ppm of metal in the form of a metal salt additive and 10 to 500 ppm of an oil soluble nitrogen containing ashless detergent additive when said solution or dispersion is added to a fuel.  
     
     
         5 . The additive composition of  claim 1 , wherein the metal is an alkali metal, alkaline earth metal, Group IVB, VIIB, VIII, IB or IIB metal, rare earth metal, or mixtures of any of the foregoing metals.  
     
     
         6 . The additive composition of  claim 1 , wherein the metal salt is a sulfonate, salicylate, naphthenate or neodecanoate.  
     
     
         7 . The additive composition of  claim 1 , wherein the ashless detergent additive is a polyisobutenyl succinimide wherein the polyisobutenyl has an Mn of 400-2500.  
     
     
         8 . The additive composition of  claim 1 , wherein there is present 10-200 ppm of the ashless detergent.  
     
     
         9 . The additive composition of  claim 1 , wherein the metal salt is a carboxylate or complex derived from a compound of the formula:  
       
         
           
           
               
               
           
         
       
       where R 1 , R 2 , R 3  and R 4  represent hydrogen or a hydrocarbyl having 1-30 carbon atoms (C 1 -C 30 ), but at least two of R 1 , R 2 , R 3  or R 4  are C 1 -C 30  hydrocarbyl; R 5  is a hydrocarbyl having 1 to 120 carbon atoms and m and n may each be zero or an integer such that the total number of carbon atoms in the carboxylate is not more than 125.  
     
     
         10 . The additive composition of  claim 1 , wherein the metal is calcium, iron or cerium.  
     
     
         11 . The fuel composition of  claim 2 , wherein the metal is an alkali metal, alkaline earth metal, Group IVB, VIIB, VIII, IB or IIB metal, rare earth metal, or mixtures of any of the foregoing metals.  
     
     
         12 . The fuel composition of  claim 2 , wherein the metal salt is a sulfonate, salicylate, naphthenate or neodecanoate.  
     
     
         13 . The fuel composition of  claim 2 , wherein the ashless detergent additive is a polyisobutenyl succinimide wherein the polyisobutenyl has an Mn of 400-2500.  
     
     
         14 . The fuel composition of  claim 2 , wherein there is present 10-200 ppm of the ashless detergent.  
     
     
         15 . The fuel composition of  claim 2  wherein the metal salt is a carboxylate or complex derived from a compound of the formula:  
       
         
           
           
               
               
           
         
       
       where R 1 , R 2 , R 3  and R 4  represent hydrogen or a hydrocarbyl having 1-30 carbon atoms (C 1 -C 30 ), but at least two of R 1 , R 2 , R 3  or R 4  are C 1 -C 30  hydrocarbyl; R 5  is a hydrocarbyl having 1 to 120 carbon atoms and m and n may each be zero or an integer such that the total number of carbon atoms in the carboxylate is not more than 125.  
     
     
         16 . The fuel composition of  claim 2 , wherein the metal is calcium, iron or cerium.  
     
     
         17 . The method of  claim 3 , wherein the metal is an alkali metal, alkaline earth metal, Group IVB, VIIB, VIII, IB or IIB metal, rare earth metal, or mixtures of any of the foregoing metals.  
     
     
         18 . The method of  claim 3 , wherein the metal salt is a sulfonate, salicylate, naphthenate or neodecanoate.  
     
     
         19 . The method of  claim 3 , wherein the ashless detergent additive is a polyisobutenyl succinimide wherein the polyisobutenyl has an Mn of 400-2500.  
     
     
         20 . The method of  claim 3 , wherein there is present 10-200 ppm of the ashless detergent.  
     
     
         21 . The method of  claim 3 , wherein the metal salt is a carboxylate or complex derived from a compound of the formula:  
       
         
           
           
               
               
           
         
       
       where R 1 , R 2 , R 3  and R 4  represent hydrogen or a hydrocarbyl having 1-30 carbon atoms (C 1 -C 30 ), but at least two of R 1 , R 2 , R 3  or R 4  are C 1 -C 30  hydrocarbyl; R 5  is a hydrocarbyl having 1 to 120 carbon atoms and m and n may each be zero or an integer such that the total number of carbon atoms in the carboxylate is not more than 125.  
     
     
         22 . The method of  claim 3 , wherein the metal is calcium, iron or cerium.  
     
     
         23 . The stable solution or dispersion of  claim 4 , wherein the metal is an alkali metal, alkaline earth metal, Group IVB, VIIB, VIII, IB or IIB metal, rare earth metal, or mixtures of any of the foregoing metals.  
     
     
         24 . The stable solution or dispersion of  claim 4 , wherein the metal salt is a sulfonate, salicylate, naphthenate or neodecanoate.  
     
     
         25 . The stable solution or dispersion of  claim 4 , wherein the ashless detergent additive is a polyisobutenyl succinimide wherein the polyisobutenyl has an Mn of 400-2500.  
     
     
         26 . The stable solution or dispersion of  claim 4 , wherein there is present 10-200 ppm of the ashless detergent.  
     
     
         27 . The stable solution or dispersion of  claim 4 , wherein the metal salt is a carboxylate or complex derived from a compound of the formula:  
       
         
           
           
               
               
           
         
       
       where R 1 , R 2 , R 3  and R 4  represent hydrogen or a hydrocarbyl having 1-30 carbon atoms (C 1 -C 30 ), but at least two of R 1 , R 2 , R 3  or R 4  are C 1 -C 30  hydrocarbyl; R 5  is a hydrocarbyl having 1 to 120 carbon atoms and m and n may each be zero or an integer such that the total number of carbon atoms in the carboxylate is not more than 125.  
     
     
         28 . The stable solution or dispersion of  claim 4 , wherein the metal is calcium, iron or cerium.