Modelling large mass removal in adsorption columns
Abstract
A mathematical model is developed to describe column adsorption when the contaminant constitutes a significant amount of the fluid. This requires modelling the variation of pressure and velocity, in addition to the usual advection-diffusion-adsorption and kinetic equations describing concentration and adsorption rates. The model builds on previous work based on a linear kinetic equation, to include both physical and chemical adsorption. A semi-analytical solution is developed and validated against a numerical solution. The model is tested against experimental data for the adsorption of large quantities of CO2 from a helium mixture, with a CO2 volume fraction ranging from 14% to 69%, and a N2 mixture with 16% to 33% CO2 volume fraction. Our results show a significant improvement with respect to models for the removal of trace amounts of contaminant.
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