Kinetics of nopyl acetate synthesis by homogeneously catalyzed esterification of acetic acid with nopol
| Autor: | Eliana Paola Hurtado-Burbano, Aida Luz Villa-Holguín |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Revista Facultad de Ingeniería Universidad de Antioquia, Iss 89 (2018) |
| Druh dokumentu: | article |
| ISSN: | 0120-6230 2422-2844 |
| Popis: | The esterification of nopol with acetic acid to produce nopyl acetate using sulfuric acid as homogeneous catalyst was studied. The reactions were carried out in a batch reactor, at different temperatures (50, 60, 70 and 80 °C), catalyst concentrations (0.0184, 0.0275, 0.0367 and 0.0480 molL−1 and molar ratio of acetic acid to nopol (1: 1, 1:2, 1:3 and 1: 4); the chemical equilibrium composition was measured at those reaction conditions. It was found that the equilibrium composition is a weak function of temperature, equilibrium conversion was 63, 68, 71 and 75% at 50, 60, 70 and 80°C, respectively. The reaction was described with a simple power-law model with a second-order kinetic model for both the forward and the backward reaction, using concentration and activities which were predicted by the Universal Functional group Contribution (UNIFAC) method for considering non-ideal behavior of the liquid phase. The forward reaction rate and the equilibrium constants increased with temperature; the relation of the pre-exponential factor with the catalyst amount was evaluated. The activation energy and pre-exponential factor estimated for the forward reaction using the kinetic model based on concentration, were respectively, 28.08 kJmol−1 and 11126 Lmol−1h −1 with a concentration of catalyst of 0.0275 M. Using the kinetic model based on activities, the forward reaction rate constant was 28.56 kJmol−1 and the kfo,act was 33860 Lmol−1h −1 . The enthalpy (34.90 kJmol−1 ) and the entropy (0.12 kJmol−1K−1 ) of reaction were determined using van’t Hoff equation. |
| Databáze: | Directory of Open Access Journals |
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