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Pyrolysis kinetics and thermodynamics of discarded Bakelite
Mahapatra Pabitra Mohan,Panda Achyut Kumar,Ahmed Sahin,Kumar Sachin 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6
The thermal degradation kinetics of discarded Bakelite was studied by using different model fitting, model-free methods (Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO), Friedman (FRM), Starink (STR), Li and Tang (LTA), Vyazovkin (VYZ), Avrami (AVM)) and Master plot (MP), for computing the kinetics triplets (A, Ea, and n) and also predict a suitable mechanism. The thermal degradation experiment of the sample was carried out from ambient to 1,000 °C at five different heating rates 5, 10, 20, 30, and 50 °C/min. under inert gas N2 atmosphere. The thermal degradation of discarded Bakelite shows an order-based F5 — model mechanism with the activation energy (Ea) of 213 KJ/mol, and the accuracy of the Ea was also proved by KAS, FWO, and VYZ iso-conversional method. The ordered-based model for the reaction mechanism was also explained by the master plot (MP). Based on the results of the non-linear method (VYZ), the mean error percentage of Ea, which is tested for various linear ways, was found to increase in the following order: FWO<KAS<STR<FRM<LTA and ranged from 0.115% to 23.492% for the degradation of discarded Bakelite. The change in free energy (ΔG), change in enthalpy (ΔH), and change in entropy (ΔS) are 560.743 KJ/mol, 100.835 KJ/mol, and −820.989× 10−3 JK−1 mol−1, respectively. The complete kinetic and thermodynamics analysis of the thermal degradation would help to design a process for the conversion of these wastes to high-valued carbonaceous products.
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