期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 902, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2019.120972
关键词
Glycolysis; Polyurethane; Polyethylene terephthalate; Degradation; Catalysis
资金
- CONACyT [A1-S-7657, 607672]
- DGAPA-UNAM [IN-200119]
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 sigma-donor or sigma-donor/pi-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. (C) 2019 Elsevier B.V. All rights reserved.
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