Effect of operating parameters on monomer production from depolymerization of waste polyethylene terephthalate in supercritical ethanol

Yan, Mi; Yang, Yayong; Shen, Tianchi; Grisdanurak, Nurak; Pariatamby, Agamuthu; Khalid, Mohammad; Hantoko, Dwi; Wibowo, Haryo

doi:10.1016/j.psep.2022.11.011

Cited by 15 publications

(5 citation statements)

References 34 publications

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“…From an economic and environmental point of view, mechanical recycling is more often used. (PET, 2022 andYan, 2023) The aim of this study was to synthesize a new acid catalyst, which would be appropriate for PET degradation. Advanced analytical techniques were used for catalyst characterization.…”

Section: Discussionmentioning

confidence: 99%

Dog Rose Oil Extract as a Potential Green Corrosion Inhibitor

Fuchs–Godec¹

2023

5th International Conference on Technologies &Amp; Business Models for Circular Economy: Conference Proceedings

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The inhibitory effect of the hydrophobic layer on the surface of copper in an acidic medium was studied by the classical potentiodynamic method and the impedance spectroscopy method. The hydrophobic character of the copper surface was achieved by immersing the sample in ethanolic octadecanoic acid with and without the addition of dog rose oil extract. The selected concentrations of the added dog rose oil extract were 0.5, 1.0, and 2.0 wt% in 0.05 molL-1 alcoholic solution of octadecanoic acid. Based on electrochemical measurements, an inhibition effect of ≈ 65% was obtained when the surface was modified by immersion in ethanolic octadecanoic acid only. With the addition of dog rose oil extract, this value increased to over 90%, depending on the concentration of dog rose oil extract added.

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Section: Discussionmentioning

confidence: 99%

Dog Rose Oil Extract as a Potential Green Corrosion Inhibitor

Fuchs–Godec¹

2023

5th International Conference on Technologies &Amp; Business Models for Circular Economy: Conference Proceedings

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“…Ultimately, the resulting compounds were separated in both liquid and solid states after filtration and collection. The solid states were primarily unreacted PET, while the phase states were predominantly DET [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Efficient Alcoholysis of Poly(ethylene terephthalate) by Using Supercritical Carbon Dioxide as a Green Solvent

Xu,

Cui,

Han

et al. 2024

Polymers

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In order to reduce the environmental impact of poly(ethylene terephthalate) (PET) plastic waste, supercritical fluids were used to facilitate effective recovery via improved solvent effects. This work focuses on the mechanisms of supercritical CO2 (ScCO2) during the alcoholysis processing of PET using systematic experiments and molecular dynamics (MD) simulations. The results of the alcoholysis experiment indicated that PET chips can be completely depolymerized within only an hour at 473 K assisted with ScCO2 at an optimal molar ratio of CO2/ethanol of 0.2. Random scission of PET dominates the early stage of the depolymerization reaction process, while specific scission dominates the following stage. Correspondingly, molecular dynamics (MD) simulations revealed that the solubilization and self-diffusion properties of ScCO2 facilitate the transportation of alcohol molecules into the bulk phase of PET, which leads to an accelerated diffusion of both oligomers and small molecules in the system. However, the presence of excessive CO2 has a negative impact on depolymerization by weakening the hydrogen bonding between polyester chain segments and ethanol, as well as decreasing the swelling degree of PET. These data provide a deep understanding of PET degradation by alcohols and the enhancement of ScCO2. It should be expected to achieve an efficient and high-yield depolymerization process of wasted polyesters assisted with ScCO2 at a relatively low temperature.

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“…A first important depolymerisation route is the catalyst-free depolymerisation, which is mainly performed under supercritical conditions at typically >220 °C/>6 MPa within tens of minutes. [143][144][145][146][147] While most works focus on methanol, recent 150 High temperature alcoholysis (>100 °C) in subcritical (but still pressurized) conditions also represents a significant amount of research. Recent efforts demonstrated the possibility to use bio-based catalyst with decent results.…”

Section: Hydrolysis In Alkaline Mediamentioning

confidence: 99%