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This work investigates the production of fatty acid ethyl esters from soybean oil in sub- and supercritical ethanol. The experiments were performed in a tubular reactor in the temperature range of 473−648 K, from 7 to 20 MPa, adopting the oil-to-ethanol molar ratio interval from 1:10 to 1:100. Results showed that temperature and pressure below the solvent critical point led to very low reaction conversions while appreciable yields were verified around 623 K and 20 MPa using an oil-to-solvent molar ratio of 1:40 and with a reaction time of approximately 15 min. A pseudo-first-order kinetic modeling was employed in representing the experimental alcoholysis data with a satisfactory agreement between experimental and calculated conversion values.
SILVA et al. (Sat,) studied this question.