文献类型：期刊文献

英文题名：Efficient glycolysis of Poly(ethylene terephthalate) to bis(hydroxyethyl) terephthalate catalyzed by non-metallic deep eutectic solvent

作者：Wei, Xin[1];Qiu, Jingwen[1];Wang, Han[1];Zheng, Weizhong[1];Sun, Weizhen[1];Zhao, Ling[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：508

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20250917980180);WOS:【SCI-EXPANDED(收录号:WOS:001437969300001)】；

基金：This work was financially supported by the National Natural Science Foundation of China under Grant (22293064) .

语种：英文

外文关键词：PET; Glycolysis; Deep eutectic solvent; Bis(hydroxyethyl) terephthalate

摘要：Polyethylene terephthalate (PET) can be depolymerized using glycolysis process into bis(hydroxyethyl) terephthalate (BHET) monomer under relatively mild conditions to realize the closed-loop recycling of PET waste plastics. However, commonly used metal-based catalysts not only bring serious negative impacts on the environment, but also the residue of metals can affect the further application of products. In this work, a green and highly active 1,5-diazabicyclo[4.3.0]non-5-ene deep eutectic solvent (DBN-DESs) was developed for efficient glycolysis of PET. The optimal reaction conditions of PET glycolysis were obtained with 100 % conversion rate of PET and 78.7 % yield of BHET, respectively. The analysis of molecular weight distribution of depolymerized products shows that the glycolysis of PET varies from heterogeneous process to homogeneous process, following the shrinking-core model. First-order reaction kinetic of PET glycolysis with DBN/urea was further built with the activation energy of 155.65 kJ/mol. In particular, the catalytic mechanism of PET glycolysis by DBN/urea was analyzed in details, which reveals that DBN/urea can promote the swelling behavior of PET, and the hydrogenbonding interaction between DBN/urea, EG and PET can also enhance the attack of hydroxyl oxygen in EG on carbonyl carbon in PET to easily breaking the ester group of PET, thus accelerating PET glycolysis.