Chemical Engineering Research & Design, Vol.160, 447-453, 2020
Isobutyl acetate by reactive distillation. Part II. Kinetic study
This work deals with the kinetic modeling of the synthesis of isobutyl acetate by liquid-phase esterification of isobutanol with acetic acid, in presence of the heterogeneous catalyst Amberlyst 15. Based upon a statistical experimental design, isothermal batch experiments were performed in the temperature range of 343.15-373.15 K, at three different catalyst loadings, and at different acid to alcohol mole ratios (1:1, 2:1 and 1:2). Preliminary experiments were run to assess the effects of internal and external mass transfer phenomena, and they were ruled out based upon the Weisz-Prater criterion. Thus, further experiments were run at stirring rates of 800 RPM, and catalyst particle diameters under 300 mu m to ensure a kinetic regime. Independent experiments were run to obtain the chemical equilibrium constant at different temperatures, and by mean of a van't Hoff equation, a Delta H-R of 16.47 kJ/mol was obtained. Incorporating the equilibrium constant, the kinetic experimental data were regressed with a molar fraction-based pseudo homogeneous model. The obtained model accurately fits experiments and it can be used for further simulation of reactive distillation processes for isobutyl acetate production. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.