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Polymers 2013, 5(4), 1258-1271; doi:10.3390/polym5041258

The Glycolysis of Poly(ethylene terephthalate) Waste: Lewis Acidic Ionic Liquids as High Efficient Catalysts

1
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2
Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin 150040, China
3
Key Laboratory of Chemical Engineering Process & Technology for High-Efficiency Conversion, College of Heilongjiang Province, School of Chemistry and Material Sciences, Heilongjiang University, Harbin 150080, China
*
Authors to whom correspondence should be addressed.
Received: 3 September 2013 / Revised: 14 October 2013 / Accepted: 29 October 2013 / Published: 13 November 2013
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Abstract

Poly(ethlyene terephthalate) waste from a local market was depolymerized by ethylene glycol (EG) in the presence of Lewis acidic ionic liquids [Bmim]ZnCl3 and the qualitative analysis showed that bis(hydroxyethyl) terephthalate was the main product. Compared with ionic liquid [Bmim]Cl, the Lewis acidic ionic liquids showed highly catalytic activity in the glycolysis of poly(ethylene terephthalate) PET. Significantly, the conversion of PET and the yield of bis(hydroxyethyl) terephthalate were achieved at 100% and 83.8% with low catalyst ([Bmim]ZnCl3) loading (0.16 wt %). Investigation also showed that the catalytic activity of [Bmim]ZnCl3 was higher than that of [Bmim]MnCl3. Catalyst [Bmim]ZnCl3 can be reused up to five times and 1H-NMR results show that the recovered catalyst is similar to the fresh one. A mechanism of the glycolysis of PET catalyzed by [Bmim]ZnCl3 was proposed.
Keywords: poly(ethlyene terephthalate); glycolysis; Lewis acidic ionic liquid; bis(hydroxyethyl) terephthalate poly(ethlyene terephthalate); glycolysis; Lewis acidic ionic liquid; bis(hydroxyethyl) terephthalate
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Yue, Q.F.; Xiao, L.F.; Zhang, M.L.; Bai, X.F. The Glycolysis of Poly(ethylene terephthalate) Waste: Lewis Acidic Ionic Liquids as High Efficient Catalysts. Polymers 2013, 5, 1258-1271.

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