Method of producing pyrolysis products from a mixed plastics stream and integration of the same in a refinery

A method of producing pyrolysis products from a mixed plastics stream, the method comprising:

• (a) conducting pyrolysis of a plastic feedstock to produce a stream of plastic pyrolysis oil;
• (b) feeding the plastic pyrolysis oil to a first fractionator to separate the plastic pyrolysis oil into a distillate fraction including naphtha and diesel boiling in the range of 36 to 370° C. and a vacuum gas oil fraction comprising hydrocarbons boiling above 370° C.;
• and
• (c) feeding the distillate fraction to a three step hydrotreating operation, the three step hydrotreating operation comprising:
• i. feeding the distillate fraction comprising naphtha and diesel boiling in the range of 36 to 370° C. to a first hydrotreating unit configured and operated to remove di-olefins by hydrogenation from the distillate fraction to produce a first product stream of dediolefinized plastic pyrolysis distillate representing all the effluent from the first hydrotreating unit, wherein the first hydrotreating unit is operated at a temperature of 150 to 210° C. and the first product stream of dediolefinized plastic pyrolysis distillate comprises less than 1 wt. % di-olefins;
• ii. feeding the first product stream directly and entirely and without additional hydrocarbons to a second hydrotreating unit configured and operated to remove mono-olefins by hydrogenation from the first product stream to produce a second product stream of deolefinized plastic pyrolysis distillate, wherein the second hydrotreating unit is operated at a temperature of 300 to 330° C. and the second product stream of deolefinized plastic pyrolysis distillate comprises less than 1 wt. % olefins;
• and
• iii. feeding the second product stream to a third hydrotreating unit configured and operated to remove sulfur by hydrodesulfurization and nitrogen by hydrodenitrogenation from the second product stream to produce a third product stream of clean plastic pyrolysis distillate, wherein the third hydrotreating unit is operated at a temperature of 330 to 420° C.