ACETIC ACID REMOVAL FROM DILUTE AQUEOUS SOLUTIONS USING ZEOLITE 13X

Year 2017, Volume: 1 Issue: 2, 159 - 190, 07.09.2017

Güler Narin

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

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