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1997•Journal of the American Oil Chemists SocietyRequires access

Kinetics of transesterification of soybean oil

H. Noureddini, Daniel Zhu

Open publisher page 1,017 citations

Abstract

Abstract Transesterification of soybean oil with methanol was investigated. Three stepwise and reversible reactions are believed to occur. The effect of variations in mixing intensity (Reynolds number=3,100 to 12,400) and temperature (30 to 70°C) on the rate of reaction were studied while the molar ratio of alcohol to triglycerol (6:1) and the concentration of catalyst (0.20 wt% based on soybean oil) were held constant. The variations in mixing intensity appear to effect the reaction parallel to the variations in temperature. A reaction mechanism consisting of an initial mass transfer‐controlled region followed by a kinetically controlled region is proposed. The experimental data for the latter region appear to be a good fit into a second‐order kinetic mechanism. The reaction rate constants and the activation energies were determined for all the forward and reverse reactions.

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What this paper is about

Abstract Transesterification of soybean oil with methanol was investigated. Three stepwise and reversible reactions are believed to occur. The effect of variations in mixing intensity (Reynolds number=3,100 to 12,400) and temperature (30 to 70°C) on the rate of reaction were studied while the molar ratio of alcohol to triglycerol (6:1) and the concentration of catalyst (0.20 wt% based on soybean oil) were held constant. The variations in mixing intensity appear to effect the reaction parallel to the variations in temperature. A reaction mechanism consisting of an initial mass transfer‐controlled region followed by a kinetically controlled region is proposed. The experimental data for the latter region appear to be a good fit into a second‐order kinetic mechanism. The reaction rate constants and the activation energies were determined for all the forward and reverse reactions.

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Available abstract

Abstract Transesterification of soybean oil with methanol was investigated. Three stepwise and reversible reactions are believed to occur. The effect of variations in mixing intensity (Reynolds number=3,100 to 12,400) and temperature (30 to 70°C) on the rate of reaction were studied while the molar ratio of alcohol to triglycerol (6:1) and the concentration of catalyst (0.20 wt% based on soybean oil) were held constant. The variations in mixing intensity appear to effect the reaction parallel to the variations in temperature. A reaction mechanism consisting of an initial mass transfer‐controlled region followed by a kinetically controlled region is proposed. The experimental data for the latter region appear to be a good fit into a second‐order kinetic mechanism. The reaction rate constants and the activation energies were determined for all the forward and reverse reactions.

Key concepts: Transesterification, Reaction rate constant, Methanol, Chemistry, Soybean oil, Catalysis, Mass transfer, Mixing (physics)

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