Process for the production of alkylbenzenes from an olefinic feedstock produced by oligomerization that is catalyzed homogeneously

A process for the production of a mixture of aromatic compounds belonging to the family of alkylbenzenes in the presence of at least one aromatic feedstock that comprises at least one compound that has a benzene core and at least one olefinic stream that is produced from an ethylene feedstock, whereby said process comprises at least:

• a) a first oligomerization of said ethylene feedstock that consists of at least one hydrocarbon effluent that comprises a mixture of olefins having a number of carbon atoms that is for the most part between 4 and 30, whereby said mixture of olefins comprises a C10-C24 olefinic fraction that has a mean linearity that is greater than 60%, in the presence of at least one homogeneous catalytic system that contains at least one zirconium-based metal precursor and at least one compound of aluminum as an activator wherein said compound of aluminum is selected from a group comprising tris(hydrocarbyl)aluminums, hydrocarbylaluminum halides, and aluminoxanes,
• b) a second oligomerization of the effluent that is obtained from a) that consists of at least one hydrocarbon effluent that comprises a mixture of olefins having a number of carbon atoms that is for the most part between 4 and 30, whereby said mixture of olefins comprises a C10-C24 olefinic fraction that has a mean linearity that is less than 50%, in the presence of at least one homogeneous catalytic system that is identical to or different from the one that is used in said stage a),
• c) at least one fractionation of the effluent that is obtained from said oligomerization b) in such a way as to recover at least one olefin-enriched olefinic stream having a number of carbon atoms that is greater than or equal to 9 and wherein the olefin-enriched olefinic stream is comprised of at least 50% by weight of branched olefins,
• d) a alkylation of said olefinic stream that is obtained from c) by at least one aromatic feedstock that comprises at least one compound that has a benzene core.