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Removal of trace amount impurities in glycolytic monomer of polyethylene terephthalate by recrystallization

文献类型：期刊论文

作者Huang, Junjie1,3,4; Yan, Dongxia1,3; Dong, Huixian1,3; Li, Fei1,2,3; Lu, Xingmei1,2,3,4,5; Xin, Jiayu1,2,3,4,5
刊名JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
出版日期2021-10-01
卷号9期号:5页码:8
关键词Bis(2-hydroxyethyl) terephthalate Polyester fiber Ethyl acetate Recrystallization Disperse dye
DOI10.1016/j.jece.2021.106277
英文摘要Chemical recycling is a promising way to achieve the closed-loop recycling for polyethylene terephthalate (PET). During this process, the post-consumer PET is depolymerized into bis(2-hydroxyethyl) terephthalate (BHET) through glycolysis and BHET can be polymerized again to produce recycled PET (rPET). However, since the applications of rPET is greatly limited to the color, recycling of PET fibers is challenged by the residual of colored impurities. In this study, a modified recrystallization process using ethyl acetate (EA) as the solvent was employed for the removal of colored impurities from the BHET. The process showed a decoloring rate of over 97.5% for the model colored impurities, performing better than the reported physical adsorption processes. Since almost no disperse dye was precipitated during the nucleation and crystal growth process due to the high solubility in EA, only a small amount of colored impurities adsorbed on the surface of crystals, leading to an excellent decolorization performance and post-consumer EA could be easily recycled through evaporation followed by condensation. Besides the model colored BHET, raw BHET obtained from the depolymerization of dark PET fibers was also purified by this modified recrystallization. By applying a composite purification strategy combining EA-based recrystallization and activated carbon adsorption, the whiteness (L*) of BHET greatly increased from around 65 to over 95 (L*=100 for pure white) and the whiteness of rPET produced from purified BHET (L*=86.21) was greatly improved compared with that from raw BHET (L*=44.01), showing the possibility of achieving the closed-loop recycling of dark PET fibers.
WOS关键词WASTE-WATER ; POLY(ETHYLENE-TEREPHTHALATE) ; DEGRADATION ; DYE ; EFFICIENCY ; CATALYST ; ACID
资助项目National Key R&D Program of China (China)[2021YFE0190800] ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences (China)[IAGM-2019-A06] ; National Natural Science Foundation of China (China)[21878314] ; National Natural Science Foundation of China (China)[21908232] ; National Natural Science Foundation of China (China)[21776289]
WOS研究方向Engineering
语种英语
WOS记录号WOS:000704349000006
出版者ELSEVIER SCI LTD
资助机构National Key R&D Program of China (China) ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences (China) ; National Natural Science Foundation of China (China)
源URL[http://ir.ipe.ac.cn/handle/122111/50447]  
专题中国科学院过程工程研究所
通讯作者Lu, Xingmei; Xin, Jiayu
作者单位1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, CAS Key Lab Green Proc & Engn, Inst Proc Engn,Beijing Key Lab Ion Liquids Clean, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Innovat Acad Green Manufacture, Beijing 100190, Peoples R China
4.Univ Chinese Acad Sci, Sino Danish Coll, Beijing 100049, Peoples R China
5.1 North 2nd St, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Huang, Junjie,Yan, Dongxia,Dong, Huixian,et al. Removal of trace amount impurities in glycolytic monomer of polyethylene terephthalate by recrystallization[J]. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING,2021,9(5):8.
APA Huang, Junjie,Yan, Dongxia,Dong, Huixian,Li, Fei,Lu, Xingmei,&Xin, Jiayu.(2021).Removal of trace amount impurities in glycolytic monomer of polyethylene terephthalate by recrystallization.JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING,9(5),8.
MLA Huang, Junjie,et al."Removal of trace amount impurities in glycolytic monomer of polyethylene terephthalate by recrystallization".JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 9.5(2021):8.

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来源：过程工程研究所

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