Metal-catalysed Poly(Ethylene) terephthalate and polyurethane degradations by glycolysis

• Published in: Journal of organometallic chemistry Vol. 902; p. 120972
• Main Authors: Esquer, Raymundo, García, Juventino J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2019
• Subjects: Catalysis; Degradation; Glycolysis; Polyethylene terephthalate; Polyurethane; Degradation; Glycolysis; Polyethylene terephthalate; Catalysis; Polyurethane
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/j.jorganchem.2019.120972

The recovery of Polyol from PolyUretane (PU) and Bis(2-HydroxyEthyl) Terephthalate (BHET) from Poly(Ethylene) Terephthalate (PET) from plastic waste by transesterification reactions was achieved, by using a wide scope of simple air-stable metal salts, Lewis acids, mixtures of commercially available phosphine/phosphite ligands with metal salts and low-valent [Ni(COD)2] as catalytic precursors, in the presence of ethyleneglycol as a transesterification agent. A kinetic study with cobalt chloride led to the conclusion that the PET degradation with metal salts behaves as a consecutive reaction with an induction period. The use of σ-donor or σ-donor/π-acceptor bidentate phosphine ligands, such as dcype and dppe, along with CoCl2 or [Ni(COD)2] improved the PET degradation process. For both rigid and flexible PU, FeCl3 was the most active catalyst precursor. [Display omitted] •PET and PU degradation by glycolysis.•Catalytic methodology.•Air stable, earth abundant and cheap catalysts.•High recovery yields.