Determination of adsorption and kinetic parameters for methyl acetate esterification and hydrolysis reaction catalyzed by Amberlyst 15

Abstract

In this paper, the adsorption equilibrium constants, dispersion coefficients, and kinetic parameters were obtained for the liquid phase reversible reaction of methanol with acetic acid catalyzed by Amberlyst 15. The adsorption and kinetic parameters are determined corresponding to two different mobile phases, methanol and water. Such parameters are required for three different applications of the model reaction: namely, synthesis of methyl acetate, removal of dilute acetic acid from wastewater, and hydrolysis of methyl acetate. Experiments were conducted in a packed bed reactor in the temperature range 313-323 K using a rectangular pulse input. A mathematical model for a quasi-homogeneous kinetics was developed. The adsorption and kinetic parameters together with their dependence on temperature were determined by tuning the simulation results to fit the experimentally measured breakthrough curves of acetic acid, water (or methanol) and methyl acetate using a state-of-the-art optimization technique, the genetic algorithm. The mathematical model was further validated using the tuned parameters to predict experimental results at different feed concentrations and flow rates. The kinetics reported in this study was obtained under conditions free of both external and internal mass transfer resistance. The computed parameters were found to predict experimental elution profiles for both batch and plug flow reactors reasonably well.

Kinetic Study of the Heterogeneous Catalytic Esterification of Acetic Acid with Methanol Using Amberlyst®15

“…The reaction proceeds via the following reaction equation : CH COOH CH OH CH COOCH H O H 3 3 3 3 2    As a volatile solvent, methyl acetate is used for the production of coatings, nitro-cellulose, cellulose acetate, cellulose ethers and celluloid, as well as for a variety of resins, plasticizers, lacquers and certain fats. 2 Besides the synthesis of methyl acetate, this esterification reaction may potentially be applied in the recovery of dilute acetic acid from aqueous solutions. 3,4 However, the production of high-purity methyl acetate is challenging due to its reaction kinetics and difficulties in product isolation.…”

Determination of Adsorption and Kinetic Parameters for Synthesis of Isobutyl Acetate Catalyzed by Amberlite Ir-122

“…The experiments were carried out in the presence of Amberlite IR-122 catalyst at different temperatures from 323 to 348 K using dioxane as solvent. As reported in previous studies (Darge and Thyrion, 1993;Dassy et al, 1994;Yu et al, 2004;Izci and Hosgun, 2007), the influence of external or pore diffusion can be neglected. Therefore, the experiments were conducted at 400 rpm.…”

“…Esterification reactions in the presence of acid catalysts are of great industrial importance (Goto et al, 1989;Kirbaşlar et al, 2001;Yu et al, 2004;Ali and Merchant, 2006). Generally, both homogeneous and heterogeneous catalysts are used to catalyze this reaction at a considerable rate.…”

“…These reactions and their reverse reactions, i.e., the hydrolysis of methyl acetate, have been considered as model reactions for reactive distillation (Yu et al, 2004;Pö pken et al, 2001).…”

Solution of an inverse adsorption problem with an epidemic genetic algorithm and the generalized extremal optimization algorithm

“…Yu et al [16] and Ziyang et al [17] have estimated adsorption equilibrium constants and kinetic parameters using GA. James et al [18] estimated adsorption isotherms coefficients with the conjugate gradient method, and Zhang et al [19] used a variation of GA for the same purpose.…”