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

Qun Yue, Lin Xiao, Mi Zhang, Xue Bai
2013 Polymers  
Poly(ethlyene terephthalate) waste from a local market was depolymerized by ethylene glycol (EG) in the presence of Lewis acidic ionic liquids [Bmim]ZnCl 3 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
more » ... erephthalate were achieved at 100% and 83.8% with low catalyst ([Bmim]ZnCl 3 ) loading (0.16 wt %). Investigation also showed that the catalytic activity of [Bmim]ZnCl 3 was higher than that of [Bmim]MnCl 3 . Catalyst [Bmim]ZnCl 3 can be reused up to five times and 1 H-NMR results show that the recovered catalyst is similar to the fresh one. A mechanism of the glycolysis of PET catalyzed by [Bmim]ZnCl 3 was proposed.
doi:10.3390/polym5041258 fatcat:zp6yiz55wndrlo4zlzchrt5sxm