Alkali-Decomposition of Poly(ethylene terephthalate) in Mixed Media of Nonaqueous Alcohol and Ether. Study on Recycling of Poly(ethylene terephthalate).

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  • Hu Lian-Chun
    Center for Environmental Science, Kyoto Institute of Technology
  • Oku Akira
    Center for Environmental Science, Kyoto Institute of Technology Department of Chemistry and Materials Technology, Kyoto Institute of Technology
  • Yamada Etsu
    Center for Environmental Science, Kyoto Institute of Technology Department of Chemistry and Materials Technology, Kyoto Institute of Technology
  • Tomari Kohei
    Department of Chemistry and Materials Technology, Kyoto Institute of Technology

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  • Alkali-Decomposition of Poly ethylene t

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Description

Alkali-decomposition (depolymerization) of poly(ethylene terephthalate) (PET) was studied in a mixed solvent of an alcohol (ethanol or methanol) and ether (dioxane, tetrahydrofuran, or dimethoxyethane). The time for complete decomposition (>96%) of solid PET with NaOH in methanol at 60°C was 40 min when dioxane (10 vol%) was added as co-solvent in the reaction mixture, whereas 7 h without dioxane. Disodium terephthalate, a product, precipitated quantitatively in the media and was separated easily. From the filtrate, ethylene glycol (EG) was recovered by distillation while, for practical use, the major portion of the filtrate was recycled repeatedly as the reaction medium.

Journal

  • Polymer Journal

    Polymer Journal 29 (9), 708-712, 1997

    The Society of Polymer Science, Japan

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