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<p>Polyethylene terephthalate (PET) is extensively used plastic, widely used for food packaging and beverage bottles due to its thermoplastic molding properties, good mechanical, lightness and transparency characteristics. Due to the substantial and steadily increasing amount of waste generated, the chemical recycling of postconsumer PET has been considered as the most successful method for polymer recycling. In this study, for the first time we report the depolymerization of PET to its bis(2-hydroxyethyl) terephthalate (BHET) monomer via glycolysis using mayenite (Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub>) derivatives as heterogeneous Lewis base-acid catalysts. Using synthetic mayenite catalyst calcined at 900&#xa0;°C, 86% conversion of PET and 69% yield of BHET at 196&#xa0;°C within 120&#xa0;min. were achieved. Thermal methods, such as isothermal calorimetry, TG and DSC, were employed to study interactions of mayenite and ethylene glycol and characterization of glycolysis products. Obtained BHET was also extensively characterized using <sup>1</sup>H, <sup>13</sup>C NMR, FT-IR spectroscopies, XRD and SEM. The developed approach allows recycling of the PET at reasonably mild conditions using cheap and eco-friendly mayenite as a catalyst.</p>

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Chemical recycling of polyethylene terephthalate by glycolysis using synthetic mayenite catalysts

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Joana Bendoraitiene,
  • Diana Masiulionyte,
  • Klaudija Bojanauskaite,
  • Laura Peciulyte,
  • Anatolijus Eisinas,
  • Kestutis Baltakys,
  • Ramune Rutkaite

摘要

Polyethylene terephthalate (PET) is extensively used plastic, widely used for food packaging and beverage bottles due to its thermoplastic molding properties, good mechanical, lightness and transparency characteristics. Due to the substantial and steadily increasing amount of waste generated, the chemical recycling of postconsumer PET has been considered as the most successful method for polymer recycling. In this study, for the first time we report the depolymerization of PET to its bis(2-hydroxyethyl) terephthalate (BHET) monomer via glycolysis using mayenite (Ca12Al14O33) derivatives as heterogeneous Lewis base-acid catalysts. Using synthetic mayenite catalyst calcined at 900 °C, 86% conversion of PET and 69% yield of BHET at 196 °C within 120 min. were achieved. Thermal methods, such as isothermal calorimetry, TG and DSC, were employed to study interactions of mayenite and ethylene glycol and characterization of glycolysis products. Obtained BHET was also extensively characterized using 1H, 13C NMR, FT-IR spectroscopies, XRD and SEM. The developed approach allows recycling of the PET at reasonably mild conditions using cheap and eco-friendly mayenite as a catalyst.