Modeling and Simulation for Dynamics of Packed Bed Adsorption
نویسنده
چکیده
Understanding the dynamics of fixed-bed adsorption columns for modeling is a demanding task due to the strong nonlinearities in the equilibrium isotherms, interference effects of competition of solutes for adsorbent sites, mass transfer resistances between fluid phase and solid phase, and fluid-dynamic dispersion phenomena. The interplay of these effects produces steep concentration fronts, which move along the column during the adsorption process, which has to be accounted for in modeling. In this study, a mathematical model is studied for a fixed bed isothermal adsorption column with porous adsorbent. Simulations are carried out to understand the influence of axial dispersion, external film resistance, and solid diffusion resistance on adsorption using the above model. The mathematical equations are solved simultaneously using finite difference explicit scheme. The effect of flow rate, mass of adsorbent, and initial concentration of adsorbate are studied. Rapid occurrence of breakthrough time is observed for higher flow rates of effluent, lower mass of adsorbent, and high initial concentration of effluent. The model parameters studied are solid diffusion coefficient, Ds, axial dispersion coefficient, DL, and external mass transfer coefficient, kf. The values of Ds and DL are found to be in the order of 10 to 10 and 10 cm/s, respectively. There is no effect of Ds and DL on the breakthrough curve. The value of kf is found to be in order of 10 to 10 cm/s. The effect of external mass transfer coefficient on the breakthrough curve is found out.
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