ACETIC ACID REMOVAL FROM DILUTE AQUEOUS SOLUTIONS USING ZEOLITE 13X

Abstract

In this study, acetic acid adsorption equilibrium and kinetics of 13X synthetic zeolite from aqueous solutions at 25, 35 and 45 °C were investigated. 13X particles (particle diameter in the range of 75-150 mm) were contacted with aqueous solutions with different initial acetic acid concentration (0.2-3 wt. %) at constant temperature in a batch reactor. Acetic acid concentrations of the liquid samples taken from the adsorption mixtures at specific time intervals were measured by titration with NaOH solution and the time required for the system to reach equilibrium and acetic acid amounts adsorbed at equilibrium were determined. The experimental adsorption kinetics data was best represented by the pseudo-second order model and the model parameters were calculated. The experimental equilibrium data was fitted to the Sips model and the model parameters were calculated. Adsorption thermodynamic parameters (standard Gibbs free energy change, enthalpy change and entropy change of adsorption) were determined. The acetic acid saturated adsorbent was regenerated by two methods in order to evaluate its reusability. Adsorption of acetic acid on 13X led to appearance of new bands in at 1390, 1472 and 1593 cm^-1 in the transmittance infrared spectrum which were assigned to the acetate ions. Regeneration of the acetic acid-saturated 13X in deionized water at 45 °C led to loss in intensities of these bands indicating dissolution of the weakly adsorbed species associated with these bands. After the heating at 300 °C, the bands at 1472 and 1593 cm^-1 disappeared whereas 1390 cm^-1 band remained and a very weak shoulder band appeared at 1720 cm^-1.

Keywords

• synthetic zeolite,acetic acid,adsorption,equilibrium,kinetics

References

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