Kinetic study of the decommissioned wind turbine blade oxidative liquefaction based on differential scanning calorimetry

Szymon Sobek, Stefan Schmölzer, Hamza Mumtaz, Marcin Sajdak, Roksana Muzyka and Sebastian Werle

Energy, 2025, vol. 316, issue C

Abstract: Differential scanning calorimetry using high-pressure crucibles was used to assess waste wind turbine blades oxidative liquefaction process kinetics. The total enthalpy change recorded at investigated temperatures 230, 250, and 265 °C were on average −650 kJ/kg, while the H2O2 decomposition contribution was determined during the control run as −365 kJ/kg. The apparent, isoconversional kinetic parameters yielded valuable information about the general decomposition pattern, with peaks of activation energy and pre-exponential profiles suggesting the decomposition of H2O2 with Eα peak of 20 kJ/mol at α = 0.4, and 2-stage decomposition of the epoxy during oxidative liquefaction with 2 consecutive Eα at α = 0.65 of 55.1 kJ/mol and 52.2 kJ/mol at α = 0.86. The master plot method identified the nth order autocatalytic model (Cn) transitioning to the Prout-Tompkins function (Bna) governing the process. The decomposition pathway was proposed, based on epoxy-radical reactions, resulting in autocatalytic epoxy decomposition during the process, paradoxically similar in mechanism to epoxy curing. The 2-stage consecutive model was formed and optimized, providing fit to the experimental data with quality assessed by R2 = 0.996. The activation parameters of the proposed model were 57.18 kJ/mol, 2.22 log(min−1), and 49.78 kJ/mol, 2.98 log(min−1) for the first and second stages respectively.

Keywords: Chemical recycling; Composite waste; DSC; Kinetics; Oxidative liquefaction; Wet oxidation; Wind turbine blades (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:316:y:2025:i:c:s0360544225002932

DOI: 10.1016/j.energy.2025.134651

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