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Title: Kinetics of Esterification and Hydrolysis of Ethyl Acetate and n-Propyl Acetate using Dowex50Wx8-400
Authors: Ahmed M. Serhan 
Supervisor: Prof. Sami H. Gh. Ali
Keywords: Hydrolysis
Issue Date: 2017
Publisher:  Kuwait university - college of graduate studies
Abstract: The kinetics of the esterification reaction of acetic acid with ethanol and n-propanol in addition to the hydrolysis of ethyl acetate and n-propyl acetate over the strong ion exchange resin Dowex 50Wx8-400 has been studied. Experiments were conducted at different stirrer speed, temperatures, catalyst loading, and reactant ratios . It was found that external and internal diffusion limitations did not affect the overall reaction rate. The conversion of reactants increased by increasing temperature and catalyst loading. Having excess of one of the reactants increased the conversion of the limiting reactant compared to equimolar amounts of reactants for both esterification and hydrolysis reactions. Several kinetic models were tested to correlate the kinetic data; the pseudo-homogeneous (P-H) model, the Eley-Rideal (E-R) model, the Langmuir-Hinshelwood (L-H) model and the Pöpken power (P-P) model. The best model found to represent all the kinetic data gathered in this investigation for both esterification and hydrolysis of ethyl acetate and n-propyl acetate was E-R 1 with α=1. This model is a single site mechanism with adsorption site for acetic acid and water. The non-adsorbed alcohol (ethanol or n-propanol) reacting with adsorbed acetic acid yielding adsorbed water and non-adsorbed ester (ethyl acetate or n-propyl acetate).Also, for the hydrolysis reaction, adsorbed water reacts with ester (ethyl acetate or n-propyl acetate) in the bulk of fluid forming acetic acid adsorbed on the active site of the resin and alcohol (either ethanol or n-propanol) in the bulk of the fluid. Increasing the chain length of the alcohol for esterification or the ester for hydrolysis had an impeding effect on the reaction conversion due to steric hindrance. This was proven through the higher activation energy value for n-propyl acetate esterification and hydrolysis than ethyl acetate activation energy value.
Appears in Programs:0640 Chemical Engineering

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