Purification of waste plastic based oil via first a trap and second via an hydrotreatment

Process for the purification of a hydrocarbon stream comprising the following steps:

• a) providing a hydrocarbon stream having a diene value of at most 1.5 g I2/100 g as measured according to UOP 326 and a bromine number of at least 5 g Br2/100 g as measured according to ASTM D1159 and containing at least 10 wt % of pyrolysis plastic oil the other part of said hydrocarbon stream being a first diluent or alternatively providing a hydrocarbon stream containing only pyrolysis plastic oil;
• d) contacting the hydrocarbon stream obtained at the step a) with silica gel, clays, alkaline or alkaline earth metal oxide, iron oxide, ion exchange resins, active carbon, active aluminium oxide, molecular sieves, alkaline oxide and/or porous supports containing lamellar double hydroxide modified or not and silica gel, or any mixture thereof to trap silicon and/or metals and/or phosphorous and/or halogenates;
• e) performing a hydrotreating step at a temperature of at least 200° C.,
• f) recovering a purified hydrocarbon stream
• characterized in that said hydrotreating step is performed over at least one catalyst that presents both (i) an hydrotreating function, namely at least one metal of group VIB in combination or not with a promotor selected from at least one metal of group VIII and/or VIIIB, and/or mixture thereof, and (ii) a trap function, namely said catalyst presents a BET surface area ranging from 150 m2/g to 400 m2/g,
• said purified hydrocarbon stream obtained at step f) is mixed with naphtha, gasoil or crude oil to have a pyrolysis plastic oil concentration ranging from 0.01 wt % to at most 50 wt %;
• before being further sent at least partially to a steam cracker to produce olefins, including ethylene and propylene, and aromatics.