文献类型：期刊文献

英文题名：Closed-loop recycling for poly(ethylene terephthalate) (PET) plastic: depolymerization, monomer separation, and recycled PET (rPET)

作者：Yang, Taishun[1];Fan, Qingming[1];He, Hao[1];Gao, Chuang[3];Yang, Zixu[3];Xu, Jing[1,2,3]

机构：[1]Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Sch Chem & Chem Engn, Nanning 530004, Peoples R China;[2]Guangxi Univ, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China

年份：2025

卷号：514

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20251818348202);WOS:【SCI-EXPANDED(收录号:WOS:001487202500001)】；

基金：This work was supported by the Guangxi Science and Technology Base and Talent Project (Guike AD23026311) , Guangxi Science and Technology Major Program (Guike AA23062018) .

语种：英文

外文关键词：Closed-loop upcycling; Catalysts; PET; Depolymerization; rPET

摘要：Closed-loop chemical recycling offers a promising solution to the end-of-life challenges of plastic waste. However, efficiently cleaving bonds to generate value-added products and develop chemically recyclable polymers remains a considerable challenge. We have developed a closed-loop upcycling strategy that depolymerizes poly (ethylene terephthalate) (PET) into bis(2-hydroxyethyl) terephthalate (BHET), followed by polycondensation to produce recycled PET (rPET). A series of xMn/Zn (x = 0, 0.5, 1, 2) catalysts, where x represents the molar ratio of Mn and Zn, were synthesized and employed to depolymerize PET plastic into the BHET monomer. The efficient PET glycolysis approach, utilizing the high surface area and weak acid sites of the 1Mn/Zn catalyst, achieved complete depolymerization of PET plastic with a BHET yield of 93.6%. The recovered monomers can be utilized to remanufacture rPET, which exhibits competitive molecular weight, thermal stability, and rheological properties. The energy efficiency and techno-economic feasibility of the strategy for recycling PET waste plastic were assessed by constructing a lab-scale 5.0 g-grade process and simulating a 1-ton-grade process. This work introduces a closed-loop "PET-BHET-rPET" process, addressing end-of-use challenges, offering a cost-effective method, and providing a sustainable solution for upcycling plastic waste.