Use of the reaction product formed from a hydrocarbyl-substituted dicarboxylic acid and a nitrogen compound to reduce fuel consumption

Abstract

The use of the reaction product formed from a hydrocarbyl-substituted dicarboxylic acid or anhydride thereof and a nitrogen compound I or a salt thereof as an additive in a fuel for reducing fuel consumption in gasoline engines.

1 . The use of the reaction product formed from (a) a hydrocarbyl-substituted dicarboxylic acid whose hydrocarbyl radical has 8 to 250 carbon atoms, or the anhydride thereof, and (b) a nitrogen compound of the general formula I 
       
         
           
           
               
               
           
         
       
       or a salt of the nitrogen compound I, where R 1  and R 2  are each independently hydrogen or a C 1 - to C 20 -hydrocarbyl radical,
 as an additive in a fuel for reducing fuel consumption in the operation of a spark-ignited internal combustion engine with this fuel or as an additive in a gasoline fuel for reduction of fuel consumption in the operation of a self-ignition internal combustion engine with this fuel. 
 
     
     
         2 . The use according to  claim 1 , wherein the hydrocarbyl-substituted dicarboxylic acid of component (a) is based on succinic acid or the anhydride thereof. 
     
     
         3 . The use according to  claim 1  or  2 , wherein the hydrocarbyl substituent in component (a) is a linear or branched C 8 - to C 40 -alkyl or -alkenyl radical or a polyisobutenyl radical having 24 to 250 carbon atoms. 
     
     
         4 . The use according to  claims 1  to  3 , wherein the nitrogen compound of component (b) is unsubstituted aminoguanidine hydrogencarbonate. 
     
     
         5 . A fuel composition comprising, in a major amount, a gasoline fuel and, in a minor amount, at least one reaction product formed from (a) a hydrocarbyl-substituted dicarboxylic acid and (b) a nitrogen compound of the general formula I according to  claims 1  to  4 , and at least one fuel additive which is different than the reaction product mentioned and has detergent action. 
     
     
         6 . The fuel composition according to  claim 5 , comprising as the fuel additive which is different than the reaction product mentioned and has detergent action at least one representative selected from:
 (Da) mono- or polyamino groups having up to 6 nitrogen atoms, at least one nitrogen atom having basic properties;   (Db) nitro groups, optionally in combination with hydroxyl groups;   (Dc) hydroxyl groups in combination with mono- or polyamino groups, at least one nitrogen atom having basic properties;   (Dd) carboxyl groups or their alkali metal or alkaline earth metal salts;   (De) sulfonic acid groups or their alkali metal or alkaline earth metal salts;   (Df) polyoxy-C 2 -C 4 -alkylene moieties terminated by hydroxyl groups, mono- or polyamino groups, at least one nitrogen atom having basic properties, or by carbamate groups;   (Dg) carboxylic ester groups;   (Dh) moieties derived from succinic anhydride and having hydroxyl and/or amino and/or amido and/or imido groups; and/or   (Di) moieties obtained by Mannich reaction of substituted phenols with aldehydes and mono- or polyamines.   
     
     
         7 . The fuel composition according to  claim 5  or  6 , additionally comprising, as a further fuel additive in a minor amount, at least one carrier oil. 
     
     
         8 . The fuel composition according to  claims 5  to  7 , additionally comprising, as a further fuel additive in a minor amount, at least one corrosion inhibitor. 
     
     
         9 . An additive concentrate comprising at least one reaction product formed from (a) a hydrocarbyl-substituted dicarboxylic acid or anhydride thereof and (b) a nitrogen compound of the general formula I according to  claims 1  to  4 , and at least one fuel additive which is different than the reaction product mentioned and has detergent action.