Method and installation for the production of a monomer by depolymerization of the corresponding polymer

A method for the production of a monomer from a feed material containing a polymer from which the monomer is a constituent, the production method being implemented in a depolymerization installation comprising a pyrolysis reactor and a condenser, the production method comprising the steps of:

• pyrolizing the feed material in the pyrolysis reactor so as to generate a gas stream, the feed material travelling from an inlet of the pyrolysis reactor to an outlet of the pyrolysis reactor with being subjected to heat such as to generate the gas stream at the outlet of the pyrolysis reactor;
• and
• condensing the monomer contained in the gas stream in the condenser such as to obtain liquid monomer;
• the production method further comprising feeding the pyrolysis reactor with solid and/or liquid impurities separated from the gas stream generated in the depolymerization installation and/or a gas stream generated in another depolymerization installation and/or with a syrup containing the polymer and/or the monomer and/or oligomers of the monomer.