Comprehensive Compilation on Esterification Reactions and Predicting Reaction Kinetics and Equilibrium Using PC-SAFT

Abstract

Knowledge of the equilibrium and kinetics of reactions is critical for optimizing industrial chemical processes. In this study, the equilibrium and kinetics of esterification reactions were systematically investigated for a series of carboxylic acids (acetic acid, propionic acid, formic acid, and levulinic acid) and alcohols (methanol, ethanol, n-propanol, and n-butanol), giving a total set of 16 esterification reactions at different temperatures. First, formation properties of reactants and products were utilized to calculate the reaction equilibrium constants Keqof these reactions. These were compared with Keqvalues obtained by one equilibrium experiment coupled to PC-SAFT predictions. The comparison yielded outstanding agreement between PC-SAFT-assisted Keqvalues and the formation-property-derived Keqvalues. The Keqvalues were then used in activity-based kinetic expressions, and the predicted reaction kinetics were validated against experimental data to demonstrate the model’s accuracy. The deviations between PC-SAFT and experimental data were AAD% (Keq) = 1.66% for the reaction equilibrium and AAD% (r) = 13.8% for the kinetic curves. The Arrhenius equation and van ’t Hoff equation were applied to depict the temperature dependence of reaction rate constants and of Keqfor each esterification reaction in a range of 303.15–423.15 K. Thus, activity-based thermodynamic standard properties are provided in this work, guiding the optimization of esterification reactions in a broad range of conditions.