Abstract
The residence time distribution and axial dispersion characteristics of an endless-belt counter-current adsorbent contactor have been studied experimentally and theoretically using, as a model system, the adsorption of CO2 from a N2 carrier on a silicalite adsorbent. Expressions for the Taylor dispersion coefficient, and hence the height equivalent to a theoretical plate (HETP), as a function of the gas flow rate and belt velocity have been derived (from the general Aris model) and are shown to provide an approximate indication of the system performance. However, dispersion in the experimental system is increased by mixing in the dead space within the apparatus, making it difficult to test the theory quantitatively. Although diffusion of CO2 in silicalite is rapid and the adsorbent layer is thin, the influence of mass transfer resistance is still appreciable. The experimental system (length of 50 cm) is shown to be equivalent to 5−10 theoretical stages (HETP 5−10 cm), depending on flow rate and belt velocity.
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