Depolymerization of Polyethylene Terephthalate with Supercritical Methanol 


Vol. 13,  No. 1, pp. 46-53, Mar.  2007


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  Abstract

We depolymerized PET in supercritical methanol and observed the yield of DMT at various reaction conditions. At subcritical state below 240℃, the yield of DMT was very low, about only 50%. It increased dramatically to 80% at supercritical state above 260℃, thereafter the increasing rate was reduced significantly. Similarly, at subcritical state of 6.89 MPa, the DMT yield was only 50%, but it increased abruptly to 85% at supercritical state of 10.34 MPa, yielding no further increase above the pressure. Within 10 minutes after the beginning of the reaction, the DMT yield reached 80% indicating that the significant portion of the reaction has proceeded, and then, the yield increased slowly. The methanol/PET ratio of 8 showed the maximum DMT yield. We found the optimum depolymerization condition for PET methanolysis is temperature 300℃, pressure 10.34 MPa, reaction time 40 minutes, and methanol/PET ratio of 8.

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  Cite this article

[IEEE Style]

A. JM, I. BH, K. S, S. JJ, "Depolymerization of Polyethylene Terephthalate with Supercritical Methanol," Clean Technology, vol. 13, no. 1, pp. 46-53, 2007. DOI: .

[ACM Style]

Ahn JM, Ihm BH, Kim S, and Shim JJ. 2007. Depolymerization of Polyethylene Terephthalate with Supercritical Methanol. Clean Technology, 13, 1, (2007), 46-53. DOI: .

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pISSN : 1598 - 9712
eISSN : 2288 - 0690

한국연구재단 등재학술지