Sub- and supercritical glycolysis of polyethylene terephthalate (PET) into the monomer bis(2-hydroxyethyl) terephthalate (BHET)

被引：154
作者：
Imran, Muhammad [1 ,2 ]
Kim, Bo-Kyung [3 ]
Han, Myungwan [3 ]
Cho, Bong Gyoo [4 ]
Kim, Do Hyun [1 ,2 ]
机构：
[1] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Taejon 305701, South Korea
[2] Korea Adv Inst Sci & Technol, Ctr Ultramicrochem Proc Syst, Taejon 305701, South Korea
[3] Chungnam Natl Univ, Dept Chem Engn, Taejon 305764, South Korea
[4] Korea Inst Geosci & Mineral Resources, Mineral Proc Dept, Taejon 305350, South Korea
来源：
POLYMER DEGRADATION AND STABILITY | 2010年 / 95卷 / 09期
关键词：
PET; Supercritical; Subcritical; Glycolysis; Plastics recycling; POLY(ETHYLENE-TEREPHTHALATE) WASTE; DEPOLYMERIZATION; DEGRADATION; METHANOLYSIS; HYDROLYSIS; PRODUCTS; CATALYST; KINETICS;
D O I：
10.1016/j.polymdegradstab.2010.05.026
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Sub- and supercritical glycolysis of polyethylene terephthalate (PET) with ethylene glycol (EG) to bis(2-hydroxyethyl) terephthalate (BHET) was investigated for the purpose of developing a PET recycling process. Supercritical glycolysis was carried out at 450 degrees C and 15.3 MPa while subcritical glycolysis was carried out at 350 degrees C and 2.49 MPa or at 300 degrees C and 1.1 MPa. High yields (gt; 90%) of the monomer BHET were obtained in both super- and subcritical cases. For the same PET/EG weight ratio of about 0.06, the optimum reaction time was 30 min for supercritical glycolysis and 75 and 120 min for two cases of subcritical glycolysis. GPC, RP-HPLC, H-1 NMR and C-13 NMR, and DSC were used to characterize the polymer and reaction products. Supercritical glycolysis will be suitable to a process requiring a high throughput due to its short reaction time. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1686 / 1693
页数：8
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