Sulfonated Hydrothermal Carbon-Based Catalyzed Esterification under Microwave Irradiation: Optimization and Kinetic Study

Laddawan Tumkot  -  Chemical Engineering Research Unit for Value Adding of Bioresources, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand
Armando T. Quitain  -  Department of Applied Chemistry and Biochemistry, Faculty of Advanced Science and, Japan
Tetsuya Kida  -  Department of Applied Chemistry and Biochemistry, Faculty of Advanced Science and, Japan
Navadol Laosiripojana  -  The Joint Graduate School of Energy and Environment, King Mongkut’s University of, Thailand
Artiwan Shotipruk  -  Chemical Engineering Research Unit for Value Adding of Bioresources, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand
*Panatpong Boonnoun  -  Chemical Engineering Program, Department of Industrial Engineering, Faculty of Engineering, Naresuan University, Thailand
Received: 9 Jan 2020; Revised: 12 Jun 2020; Accepted: 13 Jun 2020; Published: 1 Aug 2020; Available online: 30 Jul 2020.
Open Access Copyright (c) 2020 Bulletin of Chemical Reaction Engineering & Catalysis
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In this study, the esterification reaction of oleic acid (OA) with methanol was investigated in the presence of a sulfonated hydrothermal carbon-based catalyst under microwave irradiation. The reaction conditions were optimized using response surface methodology based on a central composite design. Three following variables were studied: methanol to OA molar ratios (2.5:1–7.5:1), reaction time (50–70 min) and catalyst loading (2–5 wt.%) to provide a statistical model with the coefficient of regression (R2) of 0.9407. Based on the model, the optimum OA conversion of 95.6% was predicted at 5.8:1 methanol to OA molar ratio, 60 min and 3.05 wt.% catalyst loading. The experimental validation indicated that the model gave a good prediction of OA conversion (2.8% error). Furthermore, the reaction was found to be reasonably described by the pseudo-first order kinetics. The dependency of the reaction rate constant on temperatures gave a value of the activation energy of 64 kJ/mol. Copyright © 2020 BCREC Group. All rights reserved


Keywords: Carbon-based catalyst; Esterification; Microwave irradiation; Response surface methodology; Kinetic study

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