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

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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, (1)H NMR and (13)C 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.
Publisher
ELSEVIER SCI LTD
Issue Date
2010-09
Language
English
Article Type
Article
Keywords

POLY(ETHYLENE-TEREPHTHALATE) WASTE; ETHYLENE-GLYCOL; DEPOLYMERIZATION; METHANOL; DEGRADATION; PRODUCTS; CATALYST; HYDROLYSIS; SIMULATION; KINETICS

Citation

POLYMER DEGRADATION AND STABILITY, v.95, no.9, pp.1686 - 1693

ISSN
0141-3910
DOI
10.1016/j.polymdegradstab.2010.05.026
URI
http://hdl.handle.net/10203/21720
Appears in Collection
CBE-Journal Papers(저널논문)
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