Depolymerization of Waste PET with Phosphoric Acid–Modified Silica Gel Under Microwave Irradiation |
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Authors: | Satoshi D Ohmura Choki Muroi Hajime Sakata Makoto Wada Norikazu Miyoshi |
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Institution: | 1.Department of Chemistry, Faculty of Integrated Arts and Sciences,Tokushima University,Tokushima,Japan |
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Abstract: | Chemical recycling of waste poly(ethylene terephthalate) (PET) using phosphoric acid–modified silica gel as a solid catalyst is reported. Advantageously, microwave irradiation was used to progress the depolymerization of PET. In this study, depolymerization of PET with a small amount of water is suggested as a suitable method. The depolymerized product, terephthalic acid was obtained and assigned by 1H NMR and FT-IR spectroscopy. Finally, over 90 % conversion to terephthalic acid was achieved when waste plastic bottles were treated with the method. This results confirm the importance of the microwave power technique as a promising recycling method for plastic bottles made from PET, resulting in monomer recovery in addition to substantial energy saving. |
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