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

机译:微波辐射下磷酸改性硅胶对废PET的解聚

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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 H-1 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.
机译:报道了使用磷酸改性的硅胶作为固体催化剂对废聚对苯二甲酸乙二醇酯(PET)进行化学回收的方法。有利地,使用微波辐射来进行PET的解聚。在这项研究中,建议将PET与少量水解聚是一种合适的方法。获得解聚的产物对苯二甲酸,并通过H-1 NMR和FT-IR光谱进行归属。最终,用该方法处理废塑料瓶后,可实现90%以上的对苯二甲酸转化率。该结果证实了微波功率技术作为一种有前途的回收方法的重要性,该回收方法可用于回收由PET制成的塑料瓶,不仅可节省大量能源,而且还可以回收单体。

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