| Title |
Structural analysis of bis-2-hydroxyethylene terephtalate obtained from depolymerization of polyethylene terephtalate / |
| Authors |
Masiulionytė, Diana ; Čekavičiūtė, Monika ; Pečiulytė, Laura ; Bendoraitienė, Joana |
| DOI |
10.15388/IOR2023 |
| ISBN |
9786090708835 |
| Full Text |
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| Is Part of |
Open readings 2023: 66th international conference for students of physics and natural sciences, April 18-21, 2023, Vilnius, Lithuania: annual abstract book / editors: M. Keršys, Š. Mickus.. Vilnius : Vilnius University press, 2023. p. 127.. ISBN 9786090708835 |
| Abstract [eng] |
Polyethylene terephtalate (PET) is one of the most utilized plastics for food and beverages packaging. PET does not have side effects in nature. However, there is a huge problem of increasing amount of plastic wastes in the world. Chemical recycling is one of the options to reduce PET wastes. PET glycolysis, chemical recycling method, is a transesterification reaction. There are four main techniques of glycolysis: (i) catalyzed glycolysis; (ii) solvent-assisted glycolysis; (iii) supercritical glycolysis; (iv) microwave-assisted glycolysis. PET flakes dissolve in ethylene glycol (EG) in the presence of catalyst and causes formation of bis-2- hydroxyethyl terephthalate (BHET) monomer (Scheme 1) [1]. In our research, mayenite (Ca12Al14O33) was used as a catalyst for glycolysis reaction. Synthesis and preparation of mayenite have influence for its catalytic activity. The highest surface area (m2/g) and reducibility (mmol H2/g) of mayenite particles, the more active catalysis [2]. BHET synthesis was carried out in three-neck round bottom flask. Mayenite, which calcination temperature was 900 °C, was added to EG solvent, heated until 196 °C, then PET flakes were added and mixture was heated for 2.5 hours. After 2.5 hours, the mixture was cooled in ice-bath; boiling water was poured and heated until 100 °C. Mixture was filtered still hot. The filtrate was reheated until its clear, cooled to 5 °C and left for 16 h. The obtained crystals were dried at 60 °C. The BHET structure was proved by NMR, FTIR, XRD, TA analysis and compared to reference BHET, which was received from Sigma-Aldrich and recrystallized (Fig. 1). [...]. |
| Published |
Vilnius : Vilnius University press, 2023 |
| Type |
Conference paper |
| Language |
English |
| Publication date |
2023 |
| CC license |
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