文献类型：期刊文献

英文题名：Reaction kinetic model of glycolysis of polyethylene terephthalate

作者：Wang, Ling-Han[1];Lan, Sen[1];Huang, Zi-Bin[1];Yang, Jing-Yi[1];Gong, Jian-Hong[2];Yuan, Pei-Qing[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Sinopec Res Inst Petr Proc Co Ltd, 18 Xueyuan Rd, Beijing 100083, Peoples R China

年份：2025

卷号：309

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20250917978430);WOS:【SCI-EXPANDED(收录号:WOS:001440679400001)】；

基金：The authors acknowledge the supports from NSFC (Grant No. 22178113) and CNPC (Grant No. 2023ZZ33-1) .

语种：英文

外文关键词：Glycolysis; Polyethylene terephthalate; Reaction kinetic model; Shrinking core model; Bis (2-hydroxyethyl) terephthalate; Continuous stirred-tank reactor mode

摘要：The reaction kinetics of the glycolysis of polyethylene terephthalate (PET) in ethylene glycol (EG) solvent using zinc acetate as a catalyst were investigated. The experimental results show that stirring rate, EG/PET mass ratio, and catalyst dosage all influence the glycolysis rate. The reaction temperature has a decisive effect on the glycolysis rate and the yield of the target product, bis(2-hydroxyethyl) terephthalate (BHET). By tracking the distribution of PET repeat units in the products and combining the heterogeneous shrinking core model and homogeneous reaction model, a reaction kinetic model for PET glycolysis was developed. The model accurately predicts the equilibrium product distribution at high temperature and the reaction behavior of large PET particles. The activation energy for the depolymerization of PET to oligomers is 172.71 kJ/mol, making it the ratedetermining step of the entire reaction network. The standard reaction enthalpy and entropy change for this step are 22.58 kJ/mol and 16.46 J/mol & sdot;K, respectively, indicating that PET glycolysis is an entropy-driven process that requires high temperatures. Increasing the reaction temperature significantly reduces the sensitivity of the reaction rate to PET particle diameter. When conducting PET glycolysis in a series of continuous stirred tank reactors, it is necessary to use both high temperatures and small PET particle sizes to minimize reactor volume and reduce the number of reactors in series.