文献类型：期刊文献

英文题名：Reaction kinetics and mechanism of catalyzed hydrolysis of waste PET using solid acid catalyst in supercritical CO2

作者：Li, Xue-Kun[1]; Lu, Hui[1]; Guo, Wen-Ze[1]; Cao, Gui-Ping[1]; Liu, Hong-Lai[1]; Shi, Yun-Hai[1]

机构：[1] UNILAB, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2020

卷号：61

期号：1

起止页码：200

外文期刊名：AIChE Journal

收录：EI(收录号：20144200110924)

语种：英文

外文关键词：Association reactions - Catalysts - Fourier transform infrared spectroscopy - Activation energy - Hydrolysis - Polyethylene terephthalates - Ethylene - Carbonation - Molecules - Chains - Supercritical fluid extraction - Titration - Kinetics - Reaction kinetics - Temperature

摘要：Hydrolysis of waste poly(ethylene terphthalate) (PET) using solid acid catalyst in SCCO2 is presented in this work for the first time. The mechanism of PET chains scission was proved to be a combination of chain end and random chain scission by Fourier transform - infrared spectroscopy (FT-IR) and titration analysis. A new reaction kinetics model of PET hydrolysis in SCCO2 was setup by introducing the Arrhenius equation into an ordinary reaction rate equation, the frequency factor and apparent activation energy were expressed in terms of temperature and CO2 pressure, respectively. With this reaction kinetics model, the effects of temperature, and pressure were investigated. An interesting mechanism was proposed to describe the reaction process that both water molecules and hydroniums were carried and penetrated into the amorphous regions of the swollen PET by SCCO2, subsequently hydrolysis reaction preferentially took place in the amorphous regions of both surface and bulk of PET matrix. ? 2014 American Institute of Chemical Engineers.