Non-Uniformities in Adsorbent Monoliths

TL;DRAbstract

A new, fundamental model is introduced to account for non-uniform channel geometries in monolithic adsorbents. The model, based on isothermal operation, plug flow and the full three-dimensional convection-diffusion equation, is applied to the adsorption of dichloromethane from an air stream flowing through a binderless activated carbon monolith. Equilibrium parameters and the effective diffusion coefficient for adsorption are obtained independently from gravimetric adsorption data. The new non-uniform channel model is capable of predicting breakthrough curves as a function of feed gas flow rates up to about 0.4 dimensionless concentration. Successful prediction over the whole range of concentrations almost certainly would require the isothermal model to be adapted to include the energy balance.

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