Kinetic Modeling of Shea Butter Transesterification Catalyzed by Barium Chloride Doped Clay Catalyst

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The kinetics and mechanism of transesterification of Shea butter to produce fatty acid methyl ester (FAME) were investigated using a catalyst developed from clay impregnated with barium chloride (CD-BaCl2). The catalyst was prepared by mixing 10% BaCl2 chloride with clay, drying it, and calcining it at 600°C for four hours. The synthesized catalysts were characterized using X-ray Diffraction (XRD), Scanning Electron Micrograph (SEM), Brunauer-Emmett-Teller (BET), X-ray Fluorescence (XRF) and Fourier Transform Infrared Spectroscopy (FT-IR) to determine their suitability. The effects of methanol/mol ratio, catalyst concentration, temperature, agitation speed and time on FAME production were evaluated using the synthesized catalyst. Two elementary reaction mechanisms, Eley-Rideal (ER) and Langmuir-Hinshelwood-Hougen-Watson (LHHW) were used to analyze the kinetics. CD-BaCl2 effectively converted Shea butter into FAME, and variations in the process parameters had a significant impact. A 4wt% catalyst dosage, a 10:1 methanol/oil molar ratio, a 2-hour reaction time, a speed of 300rpm, and a temperature of 60°C resulted in approximately 70% FAME. The kinetic results showed that LHHW provided the best representation of the experimental data with the CD-BaCl2 catalyst. The rate-determining step (RDS) was the surface reaction linking the adsorbed triglyceride and adsorbed alcohol. The rate increased with temperature, indicating an endothermic reaction. The activation energy and frequency factor for the reaction were 2.49 kJ/mol and 8.61 h-1, respectively, occurring at a temperature below the boiling point of methanol. The model's capability was evaluated by validating the experimental data, showing a good relationship. Keywords: FAME, shea butter, LHHW, ER, clay

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