High-power and eco-friendly fuel composition

Abstract

The present invention relates to a fuel composition comprising:—from 35% to 75% by weight of cyclopentane,—from 10% to 25% by weight of one or more aromatic hydrocarbon(s), and—up to 55% by weight of one or more branched alkane(s) chosen from 2-methylbutane and trimethylpentanes, with a weight ratio of the cyclopentane content to the aromatic hydrocarbon content greater than or equal to 2. The invention also relates to the use of such a composition for supplying a spark ignition engine, in particular for increasing the engine power and/or for reducing the specific fuel consumption of the engine and/or for increasing the octane number (RON).

1 . A fuel composition comprising
 from 35% to 75% by weight of cyclopentane,   from 10% to 25% by weight of one or more aromatic hydrocarbons, and   up to 55% by weight of one or more branched alkanes chosen from 2-methylbutane and trimethylpentanes,   with a weight ratio of the cyclopentane amount to the aromatic hydrocarbon amount greater than or equal to 2.   
     
     
         2 . The fuel composition according to  claim 1 , characterised in that the cyclopentane amount ranges from 36 to 62% by weight relative to the total weight of the composition. 
     
     
         3 . The fuel composition according to  claim 1 , characterised in that the one or more aromatic hydrocarbons are chosen from among C 7  to C 10  hydrocarbons containing a benzene ring. 
     
     
         4 . The fuel composition according to  claim 3 , characterised in that the one or more aromatic hydrocarbons are chosen from those including, on the benzene ring: a single substituent; or two substituents in the meta or para position; or three substituents in the meta position. 
     
     
         5 . The fuel composition according to  claim 4 , characterised in that the one or more aromatic hydrocarbons are chosen from among toluene, ethylbenzene, xylenes, 1-ethyl-3-methylbenzene, mesitylene (1,3,5-trimethylbenzene), 1-ethyl-3,5-dimethylbenzene, and mixtures of these compounds. 
     
     
         6 . The fuel composition according to  claim 1 , characterised in that the aromatic hydrocarbon amount ranges from 13 to 24% by weight, relative to the total weight of the composition. 
     
     
         7 . The fuel composition according to  claim 1 , characterised in that it has a weight ratio of its cyclopentane amount to its aromatic hydrocarbon amount that lies in the range of 2 to 7. 
     
     
         8 . The fuel composition according to  claim 1 , characterised in that the one or more branched alkanes are chosen from among trimethylpentanes, 2,3,3-trimethylpentane, 2,3,4-trimethylpentane and mixtures thereof. 
     
     
         9 . The fuel composition according to  claim 1 , characterised in that the branched alkane contained therein is 2,2,4-trimethylpentane (isooctane). 
     
     
         10 . The fuel composition according to  claim 1 , characterised in that it contains said one or more branched alkanes in an amount of up to 50% by weight relative to the total weight of the composition. 
     
     
         11 . Use of a composition as defined in  claim 1  to increase the RON of a gasoline fuel composition. 
     
     
         12 . The use of the fuel composition as defined in  claim 1  to supply a spark ignition direct injection engine or an indirect injection engine. 
     
     
         13 . The use according to  claim 12  to increase the power of the engine. 
     
     
         14 . The use according to  claim 12  to reduce the specific fuel consumption of the engine. 
     
     
         15 . The use according to  claim 12 , wherein the engine is a high-efficiency and high-power spark ignition engine, preferably an engine of a motor racing vehicle. 
     
     
         16 . The fuel of  claim 5 , where the xylenes comprise 1,3-dimethylbenzene or meta-xylene and 1,4-dimethylbenzene or para-xylene. 
     
     
         17 . The fuel of  claim 5 , characterised in that the one or more aromatic hydrocarbons are chosen from among toluene, xylenes and mixtures of these compounds. 
     
     
         18 . The fuel composition of  claim 7 , where the weight ratio of its cyclopentane amount to its aromatic hydrocarbon amount lies in the range of 2 to 6.5. 
     
     
         19 . The fuel composition of  claim 7 , where the weight ratio of its cyclopentane amount to its aromatic hydrocarbon amount lies in the range of 2.5 to 4. 
     
     
         20 . The fuel composition according to  claim 10 , characterised in that it contains said one or more branched alkanes in an amount in the range of 15 to 50% by weight relative to the total weight of the composition.