Fuel composition based on paraffinic hydrocarbons

Abstract

The subject matter of the present invention is a fuel composition which comprises —at least 85% by weight of one or more fractions of hydrocarbons having a distillation range within the range extending from 100 to 400° C. and having a paraffin content greater than or equal to 90% by weight; —at least a first additive consisting of a particular quaternary ammonium salt; and —at least a second additive consisting of a phenolic antioxidant. The subject matter of the invention is also the use of a composition of additives comprising said first and second additives, for improving at least one property of a paraffin-rich fuel composition.

1 . A fuel composition comprising:
 at least 85% by weight one or more paraffinic hydrocarbon fractions having a distillation range lying in the range from 100° C. to 400° C. and having a paraffin content greater than or equal to 90% by weight;   at least one first additive consisting of a quaternary ammonium salt, obtained by reaction with a quaternarization agent of a nitrogenous compound comprising a tertiary amine function, this compound being the product of the reaction of a polyisobutenyl succinic anhydride and of a compound comprising at least one tertiary amine group and at least one group selected from primary amines, secondary amines and alcohols; and   at least one second additive consisting of an antioxidant selected from the compounds comprising a phenol group.   
     
     
         2 . The composition according to  claim 1 , characterised in that the distillation range of said paraffinic hydrocarbon fraction lies in the range from 130 to 350° C. 
     
     
         3 . The composition according to  claim 1 , characterised in that the paraffin content of said paraffinic hydrocarbon fraction is greater than or equal to 95% by weight with respect to the total weight of said fraction. 
     
     
         4 . The composition according to  claim 1 , characterised in that said paraffinic hydrocarbon fraction contains at least 50% by weight isoparaffins with respect to the weight of said fraction. 
     
     
         5 . The composition according to  claim 1 , characterised in that the paraffinic hydrocarbon fraction or fractions are hydrotreated vegetable oils. 
     
     
         6 . The composition according to  claim 1 , characterised in that it comprises at least 90% by weight the paraffinic hydrocarbon fraction or fractions. 
     
     
         7 . The composition according to  claim 1 , characterised in that said compound comprising at least one tertiary amine and at least one group selected from primary amines, secondary amines and alcohol is selected from the amines of the following formula (I) or (II): 
       
         
           
           
               
               
           
         
         wherein: 
         R6 and R7 are identical or different and represent, independently of each other, an alkyl group having from 1 to 22 carbon atoms; 
         X is an alkylene group having from 1 to 20 carbon atoms; 
         m is an integer number between 1 and 5; 
         n is an integer number between 0 and 20; and 
         R8 is a hydrogen atom or a C1 to C22 alkyl group;
 and preferably among the amines of formula (I). 
 
       
     
     
         8 . The composition according to  claim 1 , characterised in that it comprises the first additive or additives in a proportion ranging from 5 to 1000 ppm with respect to the total weight of the composition. 
     
     
         9 . The composition according to  claim 1 , characterised in that the second additive is selected from alkylphenols. 
     
     
         10 . The composition according to  claim 1 , characterised in that it comprises the second additive or additives in a proportion ranging from 2 to 500 ppm with respect to the total weight of the composition. 
     
     
         11 . The composition according to  claim 1 , characterised in that it further comprises one or more aminated antioxidants selected from aliphatic, cycloaliphatic or aromatic amines, and preferably dicyclohexylamine, present in a proportion ranging from 0.2 to 50 ppm with respect to the total weight of the composition. 
     
     
         12 . The composition according to  claim 1 , characterised in that it further comprises one or more metal-passivating agents selected from amines substituted by triazole groups, alone or in a mixture, present in a proportion ranging from 0.2 to 50 ppm with respect to the total weight of the composition. 
     
     
         13 . The composition according to  claim 1 , characterised in that it further comprises one or more chelating agents, present in a proportion ranging from 0.1 to 100 ppm with respect to the total weight of the composition. 
     
     
         14 . A use of an additive composition comprising at least one first additive and at least one second additive as defined in  claim 1  for improving at least one property selected from conductivity, corrosion resistance, oxidation stability and detergence of a fuel composition, comprising at least 85% by weight one or more hydrocarbon fractions having a distillation range lying in the range from 100 to 400° C. and having a paraffin content greater than or equal to 90% by weight. 
     
     
         15 . The use according to  claim 14 , characterised in that the additive composition further comprises:
 one or more aminated antioxidants selected from aliphatic, cycloaliphatic and aromatic amines;   one or more metal-passivating agents selected from amines substituted by triazole groups, alone or in a mixture; and   one or more chelating agents.