Depolymerization of Waste PET with Phosphoric Acid–Modified Silica Gel Under Microwave Irradiation

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 sug...

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Bibliographic Details
Published in:Journal of polymers and the environment 2017-06, Vol.25 (2), p.250-257
Main Authors: Ohmura, Satoshi D., Muroi, Choki, Sakata, Hajime, Wada, Makoto, Miyoshi, Norikazu
Format: Article
Language:English
Subjects:
Acids
Bottles
Catalysts
Chemical industry
Chemical recycling
Chemistry
Chemistry and Materials Science
Depolymerization
Energy conservation
Environmental Chemistry
Environmental Engineering/Biotechnology
Industrial Chemistry/Chemical Engineering
Infrared spectroscopy
Irradiation
Materials Science
Moisture content
NMR
Nuclear magnetic resonance
Original Paper
Phosphoric acid
Plastic debris
Polyethylene terephthalate
Polymer Sciences
Recycling
Silica
Silica gel
Silicon dioxide
Terephthalic acid
Waste recycling
Water content
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Summary: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 1 H 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.
ISSN:1566-2543
1572-8919
1572-8900
DOI:10.1007/s10924-016-0802-7