Method for the treatment of plastic pyrolysis oils including single-stage hydrocracking

A process for treating a feedstock comprising a plastics pyrolysis oil comprising chlorinated compounds, said process comprising:

• a) a selective hydrogenation step performed in a reaction section fed at least with said feedstock containing chlorinated compounds, said feedstock being maintained in liquid phase, and a gas stream comprising hydrogen, in the presence of at least one selective hydrogenation catalyst, at a temperature of between 10° and 280° C., a partial pressure of hydrogen of between 1.0 and 10.0 MPa abs, and an hourly space velocity of between 0.3 and 10.0 h−1, to obtain a hydrogenated effluent with a reduced content of diolefins, wherein an amount of the gas stream comprising hydrogen feeding said reaction section of stage a) is such that the hydrogen coverage is between 1 and 50 Nm3 of hydrogen per m3 of feedstock;
• b) a hydrotreatment step performed in a hydrotreatment reaction section, containing at least one fixed-bed reactor containing n catalytic beds, n being an integer greater than or equal to 1, each comprising at least one hydrotreatment catalyst, said hydrotreatment reaction section being fed at least with said hydrogenated effluent obtained from step a) and a gas stream comprising hydrogen, said hydrotreatment reaction section having a temperature of between 25° and 430° C., a partial pressure of hydrogen of between 1.0 and 10.0 MPa abs, and an hourly space velocity of between 0.1 and 10.0 h−1, to obtain a hydrotreated effluent;
• c) a hydrocracking step performed in a hydrocracking reaction section, containing at least one fixed-bed reactor containing 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 at least with said hydrotreated effluent obtained from step b) and a gas stream comprising hydrogen, said hydrocracking reaction section having a temperature of between 25° and 480° C., a partial pressure of hydrogen of between 1.5 and 25.0 MPa abs, and an hourly space velocity of between 0.1 and 10.0 h−1, to obtain a hydrocracked effluent;
• d) a separation step, fed with the hydrocracked effluent obtained from step c) and an aqueous solution, said step being performed at a temperature of between 5° and 370° C., to obtain at least one gaseous effluent, an aqueous effluent and a hydrocarbon-based effluent, wherein the separation stage d) comprises an injection of an aqueous solution into the hydrocracking effluent resulting from stage c), upstream of the separation step;
• and
• e) fractionating all or a portion of the hydrocarbon-based effluent obtained from step d) to obtain at least one gas stream and at least two liquid hydrocarbon-based streams, which include a naphtha cut comprising compounds with a boiling point of less than or equal to 175° C. and a hydrocarbon cut comprising compounds with a boiling point of greater than 175° C.