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

被引：4

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

来源：

CHEMICAL ENGINEERING JOURNAL | 2025年 / 508卷

基金：

中国国家自然科学基金;

关键词：

PET; Glycolysis; Deep eutectic solvent; Bis(hydroxyethyl) terephthalate; DEGRADATION; EXTRACTION; KINETICS; ACETATE; DESIGN;

D O I：

10.1016/j.cej.2025.161115

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

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.

引用

页数：12

共 51 条

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