(208c) Mapping the Limitations of Breakthrough Analysis in Fixed-Bed Adsorption
In the current work, relationships to define the threshold values, or largest permissible values to obtain physically consistent simulation results, for the axial dispersion coefficient DL and the linear driving force coefficient kn are determined for various sorbent/sorbate systems. By keeping the values of DL and kn below these threshold values, non-physical and therefore non-predictive simulation results may be avoided in the design of gas separation processes. In order to generalize the threshold value relationships to any sorbate/sorbent system, the equilibrium capacity isotherm is approximated by the separation factor. Finally, a relationship between the threshold value and the separation factor is developed. The practical use of this relationship is the ability to determine the physical/non-physical threshold for any sorbate/sorbent pair through calculation of its separation factor.
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