Renewable jet fuel composition having a high content of naphthenic compounds and associated preparation method

Abstract

The present invention relates to a jet fuel composition obtained from renewable feedstocks comprising, relative to the total volume of the composition: a. from 50 to 90% by volume of at least one paraffinic base obtained from a hydrotreatment of esters and fatty acids, from a Fischer-Tropsch process or from a process for the production of jet fuel from alcohols, and which comprises at least 90% by weight of paraffins relative to the total weight of the paraffinic base, b. from 10 to 50% by volume of at least one C8-C16 naphthenic base, said naphthenic base being obtained from hydrogenation of a C8-C16 aromatic base, said aromatic base corresponding to the C8-C16 fraction of a biofuel produced by a process for converting at least one C1-C6 bioalcohol into fuel, and said aromatic base containing at least 60% by weight of aromatic compounds relative to the total weight of the aromatic base, said aromatic compounds comprising at least 50% by weight, preferably at least 80% by weight of benzene substituted by at least m methyl(s), m being an integer from 1 to 3, and optionally n C2-C5 alkyl(s), n being an integer from 1 to 3, wherein said jet fuel composition comprises from 10 to 49% by weight of naphthenic compounds relative to the total weight of the composition.

1 . A jet fuel composition obtained from renewable feedstocks comprising, relative to the total volume of the composition:
 a. from 50 to 90% by volume of at least one paraffinic base obtained from a hydrotreatment of esters and fatty acids, from a Fischer-Tropsch process, or from a process for the production of jet fuel from alcohols, and comprising at least 90% by weight of paraffins relative to the total weight of the paraffinic base,   b. from 10 to 50% by volume of at least one C8-C16 naphthenic base, said naphthenic base being obtained from hydrogenation of a C8-C16 aromatic base, said aromatic base corresponding to the C8-C16 fraction of a biofuel produced by a process for converting at least one C1-C6 bioalcohol into fuel, and said aromatic base containing at least 60% by weight of aromatic compounds relative to the total weight of the aromatic base, said aromatic compounds comprising at least 50% by weight of benzene substituted by at least m methyl(s), m being an integer from 1 to 3, and optionally n C2-C5 alkyl(s), n being an integer from 1 to 3,   
       wherein said jet fuel composition comprises from 10 to 49% by weight of naphthenic compounds relative to the total weight of the composition. 
     
     
         2 . The jet fuel composition according to  claim 1 , comprising a quantity less than or equal to 15% by volume of aromatic compounds, relative to the total volume of the composition. 
     
     
         3 . The jet fuel composition according to  claim 1 , wherein the naphthenic base comprises aromatic compounds and naphthenic compounds, and has a mass ratio between the naphthenic compounds and aromatic compounds higher than or equal to 1. 
     
     
         4 . The jet fuel composition according  claim 1 , wherein the naphthenic base has a mass ratio between the mass amount of C9-C10 naphthenic compounds in the naphthenic base and the mass amount of C9-C14 naphthenic compounds in the naphthenic base higher than or equal to 0.10. 
     
     
         5 . The jet fuel composition according to  claim 1 , additionally comprising from 1 to 18% by volume, relative to the total volume of the composition, of at least one C8-C16 aromatic base, said aromatic base corresponding to the C8-C16 fraction of a biofuel produced by a process to convert at least one C1-C6 bioalcohol to fuel, and wherein said aromatic base contains at least 60% by weight of aromatic compounds, said aromatic compounds comprising at least 50% by weight of benzene substituted by at least m methyl(s), m being an integer from 1 to 3, and optionally n C2-C5 alkyl(s), n being an integer from 1 to 3. 
     
     
         6 . A method for producing a jet fuel composition obtained from renewable feedstocks, comprising at least the following steps:
 a) producing at least one paraffinic base from hydrotreatment of esters and fatty acids, from a Fischer-Tropsch process, or from a process to produce jet fuel from alcohols, said at least one paraffinic base comprising at least 90% by weight of paraffins,   b) producing at least one C8-C16 naphthenic base comprising at least the following steps:
 i) producing a biofuel with a process to convert at least one C1-C6 bioalcohol to fuel, 
 ii) hydrogenating the biofuel obtained after step i), to obtain a hydrogenated biofuel, 
 iiii) recovering said C8-C16 naphthenic base by fractionating said hydrogenated biofuel obtained at step ii), and 
   c) mixing from 50% to 90% by volume of the at least one paraffinic base produced at step a) with from 10 to 50% by volume of the naphthenic base produced at step b), to obtain a jet fuel composition comprising a paraffinic base and a naphthenic base.   
     
     
         7 . The method for producing a jet fuel composition obtained from renewable feedstocks according to  claim 6 , wherein the hydrogenation is full. 
     
     
         8 . The method for producing a jet fuel composition obtained from renewable feedstocks according to  claim 6 , wherein the hydrogenation is partial. 
     
     
         9 . The method for producing a jet fuel composition obtained from renewable feedstocks according to  claim 6 , wherein the at least one paraffinic base obtained after step a) is produced from one or more oils chosen from among vegetable oils, animal fats, preferably non-comestible highly saturated oils, waste oils, by-products from the refining of vegetable oils or animal oil(s) containing free fatty acids, tall oils, and oils produced by bacteria, yeasts, algae, prokaryotes or eukaryotes. 
     
     
         10 . The method for producing a jet fuel composition according to  claim 6 , additionally comprising:
 a step d) to produce at least one C8-C16 aromatic base, comprising at least the following steps:
 i) producing a biofuel with a process for converting at least one C1-C6 bioalcohol to fuel, 
 ii) recovering said C8-C16 aromatic base by fractionating said biofuel obtained at step i), said C8-C16 aromatic base comprising at least 60% by weight of aromatic compounds, said aromatic compounds comprising at least 50% by weight of benzene substituted by at least m methyl(s), m being an integer from 1 to 3, and optionally n C2-C5 alkyl(s), n being an integer from 1 to 3, and 
   a step e) to add from 1% to 18% by volume, relative to the total volume of the composition of the aromatic base produced at step b) to the jet fuel composition comprising a paraffinic base and a naphthenic base obtained after step c).   
     
     
         11 . The method for producing a jet fuel composition according to  claim 6 , wherein steps a), b), c) are conducted in separate processes. 
     
     
         12 . The method for producing a jet fuel composition according to  claim 10 , wherein steps a), b), c), d) and e) are conducted in separate processes.