Experimental Investigation of Equilibrium Adsorption for Pure Propylene on 13X and Li- Modified 13X Zeolites

Abstract

Propylene is one of the most commonly used materials in petrochemical industries. In most methods for producing propylene, a mixture of propylene and propane is achieved. In recent decades, among various separation methods for these mixtures, adsorption process have been concerned as a preferred one due to features such as low operating cost, simplicity and low energy consumption. In this work, the equilibrium adsorption of pure propylene over two commercial zeolite types (13X and Li-modified 13X) has been investigated. The experiments have been performed using static volumetric method at 293, 303 and 323 K and the pressure up to 2.5 bar. The results indicated that the equilibrium adsorption capacity of 13X is greater than Li-modified 13X (about 10 to 30%) at these operating conditions. Four Equilibrium isotherm models, namely, Freundlich, Langmuir, Toth and Sips have been implemented to analyze the equilibrium data. Equilibrium results were in good agreement with Toth and Sips isotherms for propylene adsorption over 13X. However, the results of equilibrium isotherm of propylene over Li-13X indicated that none of these models fit the experimental data correctly. This phenomenon may be due to the chemical adsorption
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