PVC PLASTICS-BASED WASTE RECYCLING PROCESS BY LIQUID-LIQUID EXTRACTION

Abstract

The present invention relates to a process for recovering a purified PVC polymer stream from a PVC-based plastic feed comprising one or more PVC polymers and at least two families of additives, employing a two-phase solvent system comprising two immiscible liquid phases A and B, said process comprising: a) a dissolution step comprising contacting said plastic feed with a dissolution liquid consisting of phase A, to obtain at least one crude polymer solution (1); b) a liquid-liquid extraction step, in at least one zone, of the crude polymer solution (1), in the presence of a single extraction liquid (4) consisting of phase B to obtain a purified polymer solution (3) and at least one final additive stream (2) comprising said at least two families of additives;c) a polymer-solvent separation step, to separate the purified polymer solution into a stream of purified PVC polymer(s) and at least a solvent fraction comprising phase A. Figure 1 to be published;