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]E China Univ Sci & Technol, State Key Lab Chem Engn, UNILAB, Shanghai 200237, Peoples R China

年份：2015

卷号：61

期号：1

起止页码：200

外文期刊名：AICHE JOURNAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000346598500018)】；

基金：This work is supported by the National Natural Science Foundation of China (NSFC), Grant numbers: 20676031 and 20876051.

语种：英文

外文关键词：PET hydrolysis; supercritical carbon dioxide; solid acid catalyst; CO2-induced crystallization; amorphous and crystalline regions

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. (c) 2014 American Institute of Chemical Engineers AIChE J, 61: 200-214, 2015