Method for producing middle distillates and naphtha from a feedstock comprising an aromatic pyrolysis oil fraction

A process for producing middle distillates and naphtha from a feedstock comprising a heavy fraction of hydrocarbons of fossil origin, of which at least 50% by weight of the compounds have an initial boiling point higher than 300° C. and a final boiling point less than 700° C., and a fraction of plastic and/or tire and/or solid recovered fuel pyrolysis oil with an aromatic compound content of more than 30% by weight relative to the weight of the pyrolysis oil, said pyrolysis oil fraction constituting less than 50% by weight of said feedstock, said process comprising:

• a) a hydrotreating step carried out in a hydrotreating reaction section, using at least one fixed-bed reactor having n catalytic beds, n being an integer greater than or equal to 1, each comprising at least one hydrotreating catalyst, said hydrotreating reaction section being fed at least with said feedstock and a gas stream comprising hydrogen, said hydrotreating reaction section being employed at a temperature between 200 and 450° C., a pressure between 2.0 and 18.0 MPa abs. and an hourly space velocity between 0.1 and 6.0 h−1, and at an introduced amount of hydrogen such that the liters of hydrogen/liters of hydrocarbon volume ratio is between 100 and 3000 nl/l, in order to obtain a hydrotreated effluent;
• b) a hydrocracking step carried out in a hydrocracking reaction section, using at least one fixed-bed reactor having n catalytic beds, n being an integer greater than or equal to 1, each comprising at least one hydrocracking catalyst, said hydrocracking reaction section being fed with at least part of said hydrotreated effluent from step a) and a gas stream comprising hydrogen, said hydrocracking reaction section being operated at a temperature of between 200 and 450° C., a pressure of between 2.0 and 18.0 MPa abs. and an hourly space velocity of between 0.1 and 12.0 h−1, and at an introduced amount of hydrogen such that the liters of hydrogen/liters of hydrocarbon volume ratio is between 100 and 3000 nl/l, to obtain a hydrocracked effluent;
• c) a separation step, fed with at least part of the hydrocracked effluent from step b), in a separation section, to produce at least one gas effluent comprising hydrogen, and at least one liquid effluent;
• d) a fractionation step, fed with at least part of the liquid effluent from step c), in a fractionation section, to produce at least one naphtha cut, at least one middle distillate cut and at least one unconverted heavy liquid cut.