Recycling and depolymerization of waste polyethylene terephthalate bottles by alcohol alkali hydrolysis

醇碱水解作用下废旧聚酯瓶的解聚回收利用（英文）

In this work,a novel alcohol alkali hydrolysis method was explored for the preparation of terephthalic acid(TPA)from waste polyethylene terephthalate(PET).First,a series of single factor experiments on the depolymerization rate of waste PET bottles and the yield of TPA were conducted to determine the optimized experimental conditions,in terms of reaction time,reaction temperature,dosage of ethylene glycol and sodium bicarbonate,amount of distilled water and stirring rate.Then IR spectra and elemental analysis were carried out for the characterization of obtained product.Under optimal experimental conditions,over 98%PET can be depolymerized into the target product(TPA)and the purity and yield of TPA are over 97%and 94%,respectively.Both the experimental and analytical results support a feasible process for the preparation of TPA from waste PET.It is expected that this alcohol alkali hydrolysis method can promise an effective way for the sustainable recycling of waste PET.

本文采用醇碱水解法,结合醇解和碱性水解的特点,在相对低温低压的条件下,实现废旧聚酯瓶的快速分解,获得苯二甲酸和乙二醇。研究中主要考察反应温度、反应时间、搅拌速率、物料配比等对废旧聚酯瓶解聚效果的影响,获得最佳反应条件,并通过红外分析和热分析表征目标产物。结果表明:在优化条件下,通过醇碱水解法能够快速有效分解废旧聚酯并获得较高纯度的目标产物。