20.500.12556/DKUM-85900 Kinetics study of hydrothermal degradation of PET waste into useful products Kinetics of hydrothermal degradation of colorless polyethylene terephthalate (PET) waste was studied at two temperatures (300 °C and 350 °C) and reaction times from 1 to 240 min. PET waste was decomposed in subcritical water (SubCW) by hydrolysis to terephthalic acid (TPA) and ethylene glycol (EG) as the main products. This was followed by further degradation of TPA to benzoic acid by decarboxylation and degradation of EG to acetaldehyde by a dehydration reaction. Furthermore, by-products such as isophthalic acid (IPA) and 1,4-dioxane were also detected in the reaction mixture. Taking into account these most represented products, a simplified kinetic model describing the degradation of PET has been developed, considering irreversible consecutive reactions that take place as parallel in reaction mixture. The reaction rate constants (k1–k6) for the individual reactions were calculated and it was observed that all reactions follow first-order kinetics. PET waste subcritical water kinetics degradation TPA odpadki PET subkritična voda kinetika degradacija true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/journal/processes © 2021 by the authors Znanstveno delo 2023-09-18 13:42:14 2023-09-18 13:42:14 2025-05-13 12:37:32 0000-00-00 00:00:00 2022 0 0 12 str. Št. 1, št. članka 24 Letn. 10 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2021-12-06 2021-12-21 2021-12-23 66.02 92221955 10.3390/pr10010024 2227-9717 Kinetics_Study_of_Hydrothermal_Deg-Colnik-2022.pdf Kinetics_Study_of_Hydrothermal_Deg-Colnik-2022.pdf 1 D16B3ECD53F9DF2159B9015FDF4C508A cefd4fda8a92f073cf531e6b493391bca9e58da032f60ce5aa001dafde108dbf cf017c2b-5618-11ee-86d1-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=172451 https://www.mdpi.com/2227-9717/10/1/24 0 d57750d3-5618-11ee-86d1-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=172452 Fakulteta za kemijo in kemijsko tehnologijo Medicinska fakulteta 0 0 0