Nevertheless, at the beginning of the reaction, the estimated conversion (outside of industrial interests) showed important deviations. The evolution of the reactions was predicted quite well for all the experiments carried out with very different reaction rates. Our strategy was based on both the comparison of the experimental u s values and the theoretical ones correlated by means of triglyceride conversion and on the estimation of the sound speed of oil/ethanol that could emulate the resistance offered by the interphase. Nomoto’s expression for homogeneous mixtures offered suitable u s estimation but with values notably higher than the experimental ones due to the resistance to sound propagation offered by the ethanol/oil interphase (non-homogeneous medium). Experimentally, u s slightly increased with the reaction time in all cases as a result of the contribution of its dynamic mixture components. The sound propagation speed measurement u s is used for monitoring triglyceride ethanolysis in a broad range of reaction conditions (mainly, temperature: 23–50 ☌ ethanol/oil: from 6 to 24 mol/mol).
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