PROCESS FOR CONVERSION OF WASTE PLASTICS INTO CHEMICALS

The present invention relates to a process for the conversion of plastics to chemicals comprising in this order the steps of: (i) providing a plastics stream (A) comprising polyvinyl chloride (PVC); (ii) supplying the plastics stream (A) and a solvent (S) to a reactor vessel (1); (iii) subjecting the plastics in the reactor vessel to a temperature of > 250°C to < 350, preferably of > 275°C and < 325°C, preferably for a period of 5-30 minutes, under applying a vacuum, preferably of < 200 mbar, or using an inert gas sweep, and evacuating the generated hydrogen chloride (B) from the vessel, wherein the PVC is partially dechlorinated to form a plastics stream (C) comprising partially unsaturated PVC; (iv) removing the plastics stream (C) comprising partially unsaturated PVC from the reaction vessel; (v) separating in a separation system (2) at least a part of the partially unsaturated PVC from the plastics stream to form a dechlorinated plastics stream (D) comprising the solvent; (vi) combining the stream (D) with an atmospheric residue stream (N) to obtain a stream (O); (vii) supplying the stream (O) to a vacuum distillation unit (3) to produce a vacuum gas oil stream (Q) and a vacuum residue stream (P) that meets the chlorine specifications for a coker unit (4); and (viii) providing the stream (P) to the coker unit, and subjecting the coker unit (4) to such conditions to obtain a liquid coker stream (I) and a solid coke product (L). Such process allows for the conversion of plastic compositions comprising PVC into chemical products that are suitable for renewed use as raw materials in for example the production of high-quality polymer materials, thereby contributing to improvement of circular use of plastic materials. La présente invention concerne un procédé de conversion de matières plastiques en produits chimiques. Ledit procédé comprend dans cet ordre les étapes consistant à : (i) fournir un courant de matières plastiques (A) comprenant du polychlorure de vinyle (PVC)) ; (ii) fournir le courant de matières plastiques (A) et un solvant (S) à une cuve de réacteur (1) ; (iii) soumettre les matières plastiques dans la cuve de réacteur à une température de > 250 à < 350 °C, de préférence de > 275 et < 325 °C, de préférence pendant une durée de 5 à 30 minutes, appliquer un vide, de préférence d'au moins 200 mbar, ou utiliser un balayage de gaz inerte, et évacuer le chlorure d'hydrogène généré (B) à partir du récipient, le PVC étant partiellement déchloré pour