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2.3 PSA Modeling Figure 2.1: A composite adsorbent pellet with different mass transfer resistances [156] Macropores function as diffusion paths of adsorbate molecules from outside the pellet to the micropores. As a result of such porous network, adsorption/desorption kinetics is controlled by intra-particle diffusion. • Selectivity: An adsorbent must selectively retain one or more adsorbates from the fluid phase. This can be achieved either by equilibrium selectivity, in which species adsorb differently as a consequence of different equilibrium affinities, or by kinetic selectivity, in which relative adsorption depends on the difference of intra-particle diffusion rates among different adsorbate species. 2.3 PSA Modeling 2.3.1 Mass Transfer At the microscopic level (see Figure 2.1), process of adsorption involves following steps in sequence (desorption step follows these steps in reverse): 1. The adsorbate diffuses from the bulk fluid phase to the external surface of the adsorbent pellet 2. From the external surface, adsorbate diffuses into and through the macropores. Chapter 2. Pressure Swing Adsorption 14PDF Image | Design and Operation of Pressure Swing Adsorption Processes
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