Adsorption of xylene isomers on Na-BETA zeolite: Equilibrium in batch adsorber

In this article, adsorption of p-xylene, m-xylene, o-xylene, and ethylbenzene on Na-BETA type zeolite in liquid phase at 15, 25, and 35 °C has been studied and the single adsorption isotherms have been obtained and reported. The Langmuir isotherm model was used to describe the experimental adsorption isotherm data. It was found that p-xylene is more strongly adsorbed component followed by ethylbenzene, m-xylene and o-xylene. This means that this adsorbent is selective for p-xylene. Using Langmuir isotherm model, the saturation adsorption capacities of the adsorbent were obtained as follows 143 mg/g for p-xylene, 105 mg/g for ethylbenzene, 83 mg/g for m-xylene, and 68 mg/g for o-xylene at 25 °C. The heat of adsorption was also estimated to be 12.0, 11.4, 9.6, and 8.3 kJ/mol−1 for p-xylene, ethylbenzene, m-xylene, and o-xylene, respectively.

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► Adsorption of p-xylene, m-xylene, o-xylene, and ethylbenzene on Na-BETA type zeolite is studied.
► The Langmuir isotherm is used to describe the experimental data.
► The saturation adsorption capacity of the adsorbent is obtained.
► The heat of adsorption is estimated.