Abstract
The degradation of polyethylene terephthalate (PET) in supercritical methanolwas investigated with the aim of developing a process for chemical recycling ofwaste plastics. A batch reactor was used at temperatures of 573–623 K under anestimated pressure of 20 MPa for a reaction time of 2–120 min. PET wasdecomposed to its monomers, dimethyl terephthalate and ethylene glycol, bymethanolysis in supercritical methanol. The reaction products were analysedusing size-exclusion chromatography, gas chromatography–mass spectrometry, andreversed-phase liquid chromatography. The molecular weight distribution of theproducts was obtained as a function of reaction time. The yields of monomercomponents of the decomposition products including by-products were measured.Continuous kinetics analysis was performed on the experimental data.
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