LAPSE:2023.3286
Published Article
LAPSE:2023.3286
Kinetics Study of Hydrothermal Degradation of PET Waste into Useful Products
February 22, 2023
Abstract
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.
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.
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Keywords
degradation, kinetics, PET waste, subcritical water, TPA
Subject
Suggested Citation
Čolnik M, Pečar D, Knez Ž, Goršek A, Škerget M. Kinetics Study of Hydrothermal Degradation of PET Waste into Useful Products. (2023). LAPSE:2023.3286
Author Affiliations
Čolnik M: Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia [ORCID]
Pečar D: Laboratory for Process Systems Engineering and Sustainable Development, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia [ORCID]
Knez Ž: Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia; Department for Chemistry, Faculty of Medicine, University of Maribor, Taborska 8, SI-200 [ORCID]
Goršek A: Laboratory for Process Systems Engineering and Sustainable Development, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
Škerget M: Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia [ORCID]
Pečar D: Laboratory for Process Systems Engineering and Sustainable Development, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia [ORCID]
Knez Ž: Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia; Department for Chemistry, Faculty of Medicine, University of Maribor, Taborska 8, SI-200 [ORCID]
Goršek A: Laboratory for Process Systems Engineering and Sustainable Development, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
Škerget M: Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia [ORCID]
Journal Name
Processes
Volume
10
Issue
1
First Page
24
Year
2021
Publication Date
2021-12-23
ISSN
2227-9717
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Original Submission
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PII: pr10010024, Publication Type: Journal Article
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LAPSE:2023.3286
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https://doi.org/10.3390/pr10010024
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Feb 22, 2023
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