200 g of PET was dissolved in 200 g of NMP at 180 °C to obtain a dark orange reaction mixture. A measured amount of glycerol and [EMIM] Cl was then added to the reaction mixture in accordance with Table 1 for controlled depolymerization. A near-instantaneous decrease in viscosity was observed. The reaction mixture was heated at 180 °C for 18 h, then quenched in deionized water (500 mL) at ambient temperature, followed by precipitation. Precipitate was removed via vacuum filtration and placed into 500 mL of deionized water with stirring for washing. This cycle was repeated twice. Precipitate was then collected through vacuum filtration and dried in a convection oven at 80 °C to obtain recovered PET (RPET) compositions, yields of polymeric material recovery were calculated against initial mass of PET (200 g): RPET 5:1 (192 g, yield of recovery: 96%), RPET 5:3 (193 g, yield of recovery: 97%), and RPET 1:1 (170 g, yield of recovery: 85%).