Pyrolysis oil purification

Process for the purification of a crude pyrolysis oil, the process comprising the steps of

• B1) providing a crude pyrolysis oil, the crude pyrolysis oil comprising hydrocarbons and impurities, the crude pyrolysis oil at least partially originating from pyrolysis of plastic waste,
• B2) mixing the crude pyrolysis oil with a polar washing solvent in a first reactor to obtain a washed crude pyrolysis oil phase and a polar washing solvent phase, the polar washing solvent phase comprising at least a part of the impurities,
• B3) separating the polar washing solvent phase from the washed crude pyrolysis oil phase,
• B4) oxidising either in the first reactor or in a second reactor the washed crude pyrolysis oil phase in the presence of an oxidation agent to obtain an oxidised purified pyrolysis oil, the oxidised purified pyrolysis oil comprising oxidised impurities,
• B5) separating the oxidised impurities from the oxidised purified pyrolysis oil to obtain a purified pyrolysis oil,
• wherein the oxidation agent comprises hydrogen peroxide and a metal salt, and wherein the polar washing solvent comprises water, alkanol or a mixture thereof, and further comprises an acid or a base.