文献类型：期刊文献

英文题名：Highly-Efficient Recycling of Poly(ethylene terephthalate)/Polyethylene Film through Low-Temperature Methanolysis Catalyzed by Nonmetallic Deep Eutectic Solvent

作者：Wang, Xiashi[1];Wei, Xin[1];Qiu, Jingwen[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 & Low carbon Technol, Shanghai 200237, Peoples R China

年份：2025

卷号：18

期号：24

外文期刊名：CHEMSUSCHEM

收录：;EI(收录号：20254319384770);WOS:【SCI-EXPANDED(收录号:WOS:001599397700001)】；

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：deep eutectic solvent; methanolysis; Poly(ethyleneterephthalate)/Polyethylene multilayer films

摘要：While the poly(ethylene terephthalate) (PET)/polyethylene (PE) multilayer films find extensive applications, particularly in packaging, the recovery of single PE layer or high-purity monomers from these films is seriously hindered by their complex compositions. Herein, a novel low-temperature methanolysis strategy for the highly efficient recycling PET/PE multilayer films with nonmetallic deep eutectic solvent (DES) is developed, where PET can be depolymerized to dimethyl terephthalate (DMT) and ethylene glycol (EG) monomers at 115 degrees C and 0.45 MPa for 60 min with 100% PET conversion and up to 97.1% DMT yield while PE maintains its stability. The process flow for the high-efficient recycling of PET/PE multilayer films is proposed, consisting of the methanolysis step and two solid-liquid separation ones to obtain the PE, DMT, and EG products. The process optimization, catalyzed mechanism, and swelling behaviors of DES for the PET methanolysis are studied. Finally, the kilogram-scale experiments under best conditions also can obtain 100% PET conversion and 87.8% DMT yield with complete recovery of PE, which efficiently confirms scalability of the proposed recycling pathway. This work establishes a sustainable pathway for closed-loop recycling of multilayer plastics by integrating PE material recovery with PET chemical upcycling.