Process for the treatment of plastics pyrolysis oils including a hydrogenation stage and a hot separation

A process for treatment of a feedstock comprising a plastics pyrolysis oil, said process comprising:

• a) a hydrogenation stage carried out in a hydrogenation reaction section, employing 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 hydrogenation catalyst, said hydrogenation reaction section being fed at least with said feedstock as a mixture with at least a part of a liquid effluent resulting from a separation stage c) and a first gas stream comprising hydrogen, said hydrogenation reaction section being employed at an average temperature between 14° and 400° C., a partial hydrogen pressure between 1.0 and 10.0 MPa abs. and an hourly space velocity between 0.1 and 10.0 h−1, in order to obtain a hydrogenated effluent,
• b) a hydrotreating stage carried out in a hydrotreating reaction section, employing 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 hydrogenated effluent resulting from stage a) and a second gas stream comprising hydrogen, said hydrotreating reaction section being employed at an average temperature between 250 and 430° C., a partial hydrogen pressure between 1.0 and 10.0 MPa abs. and an hourly space velocity between 0.1 and 10.0 h−1, in order to obtain a hydrotreated effluent,
• c) a separation stage, fed with the hydrotreated effluent resulting from stage b), said stage being carried out at a temperature of between 20° and 450° C. and at a pressure substantially identical to the pressure of stage b), in order to obtain at least a first gaseous effluent, and the liquid effluent, a part of which is recycled upstream of stage a),
• d) a separation stage, fed with the first gaseous effluent and another part of the liquid effluent resulting from stage c) and an aqueous solution, said stage being carried out at a temperature of between 20 and less than 200° C. and at a pressure substantially identical to or less than the pressure of stage c), in order to obtain at least a second gaseous effluent, an aqueous effluent and a hydrocarbon effluent,
• e) optionally a stage of fractionation of all or part of the hydrocarbon effluent resulting from stage d), in order to obtain at least a third gaseous effluent and at least a first hydrocarbon cut comprising compounds having a boiling point of less than or equal to 175° C. and a second hydrocarbon cut comprising compounds having a boiling point of greater than 175° C.,
• f) optionally, a hydrocracking stage carried out in a hydrocracking reaction section, employing 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 a part of said hydrocarbon effluent resulting from stage d) and/or with at least a part of the second hydrocarbon cut comprising compounds having a boiling point of greater than 175° C. resulting from stage e) and a third gas stream comprising hydrogen, said hydrocracking reaction section being employed at an average temperature between 25° and 450° C., a partial hydrogen pressure between 1.5 and 20.0 MPa abs. and an hourly space velocity between 0.1 and 10.0 h−1, in order to obtain a first hydrocracked effluent.