Investigation and Comparison of Complete Kinetics, Approximation of Linear and Equilibrium Driving Force in the Simulation of gas Adsorption Systems

Document Type : Research Article


Department of Chemical Engineering, Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University, Bushehr, I.R. IRAN


In this study, the points of view of complete kinetics method, approximation of linear driving force and equilibrium method in the simulation of gas adsorption systems with the numerical calculation of differential quadrature element-increment method were investigated. So that, in the method of complete kinetics, all mechanisms including Knudsen diffusion, viscous flow, slip flow, molecular diffusion and surface diffusion are considered. In linear driving force approximation, mass transfer is expressed by a general mass transfer coefficient instead of all mass transfer resistances, and as a result, elapsed time of calculations is reduced. However, the approximation of the linear driving force is highly dependent on the average radius of the particle adsorbent, and increasing the particle radius causes more deviation from the complete kinetic point of view. In the equilibrium method, adsorption kinetics is not considered and concentration changes in the system are determined based on the equilibrium adsorption isotherm. The results show that with the increase in the radius of the adsorbent particles, the complete kinetic view will be a more appropriate method to describe the adsorption behavior. It was also observed that the overall mass transfer coefficient changes in the adsorption process, depending on the temperature and pressure conditions, so that an increase in temperature causes it to increase, and this dependence is more sensitive at low pressures. In addition, with increasing pressure, the overall mass transfer coefficient passes through a minimum value and then increases.


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