Optimized method for processing plastic pyrolysis oils for improving their use

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

• a) performing a selective hydrogenation stage in a reaction section fed at least with said feedstock maintained in the liquid phase and a gas stream comprising hydrogen to obtain a hydrogenated effluent, wherein said selective hydrogenation is performed in the presence of at least one selective hydrogenation catalyst, at a temperature between 100 and 250° C., at a hydrogen partial pressure between 1.0 and 10.0 MPa absolute and at an hourly space velocity between 1.0 and 10.0 h1;
• b) performing a hydrotreating stage in a hydrotreating reaction section employing a fixed-bed reactor having n catalytic beds, n being an integer greater than or equal to 1, each bed comprising at least one hydrotreating catalyst, said hydrotreating reaction section being fed at least with said hydrogenated effluent and a gas stream comprising hydrogen to obtain a hydrotreating effluent,
• wherein the hydrogenated effluent and a gas stream comprising hydrogen are fed to a first catalytic bed of said hydrotreating reaction section, and
• wherein said hydrotreating is performed at a temperature between 250 and 430° C., at a hydrogen partial pressure between 1.0 and 10.0 MPa absolute and at an hourly space velocity between 0.1 and 10.0 h1;
• c) performing a separation stage comprising feeding the hydrotreating effluent and an aqueous solution into said separation step to obtain at least one gaseous effluent, an aqueous effluent, and a hydrocarbon effluent, said separation being operated at a temperature between 50 and 370° C., wherein the separation comprises injection of the aqueous solution into the hydrotreating effluent upstream of the separation;
• d) optionally a stage of fractionating all or part of the hydrocarbon effluent to obtain at least one gas stream and at least one hydrocarbon stream;
• and
• e) a recycling stage comprising recovering a recycle stream comprising a fraction of the hydrocarbon effluent resulting from the separation c) or at least a fraction of at least one of the hydrocarbon stream(s) resulting from the optional fractionation, and recycling at least a fraction of said recycle stream to the selective hydrogenation, the hydrotreating or both the selective hydrogenation and hydrotreating;
• wherein an amine stream is injected upstream of the selective hydrogenation stage.