The global production of plastics increases continuously as a result of their unique properties that make them suitable for a vast number of applications, form very specialized to multipurpose and from single, short-term to long term ones. As a consequence, waste plastics also increase and engineers face the challenge to develop efficient and economical recycling processes. The Selective Dissolution/Precipitation technique for plastics separation and recycling is a very promising technology that can be applied to various types of plastic waste and has already some industrial applications. The procedure is as follows: the mixture of polymers is separated using different solvents and/or conditions to successively dissolve one polymer of the mixture at a time. The dissolved plastic is recovered from the solution using several precipitation techniques, such as addition of a non-solvent, cooling, solvent evaporation, etc. The advantage of this technique is that it yields pure polymers with quality similar to that of the virgin ones. Selective Dissolution/Precipitation using a non-solvent for polymer separation has been one of the research areas of our group both theoretically (phase equilibrium in polymer solutions) and experimentally. In the framework of a European funded project, TTPL has developed a pilot scale unit for the separation of plastic waste contained in municipal solid waste, and proved the technological and economic efficiency of the process.