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and that the mass transfer resistance in the film is very low due to the small film thickness and high effective diffusivity for CO2 in the NaX film. Experimental data were used to obtain overall mass transfer linear driving force constants which were subsequently used in a numerical simulation program to estimate the performance of the adsorbents for CO2/N2 separation in a VSA process. It was found that the recovery of structured adsorbents was superior to a packed bed due to the much shorter mass transfer zone. The purity on the other hand was not as high as that obtained with a packed bed due to excessive voidage in the structured adsorbents. Increased cell density or improved zeolite loading of the structured adsorbents would improve CO2 purity without sacrificing recovery for the structured adsorbents and this represents a path forward to improved VSA performance for CO2 capture. Key words: Structured adsorbent, simulation, CO2 adsorption, pressure swing adsorption, cycle time 1. Introduction Over the last decade, there has been considerable interest in intensification of separation processes. In cyclic processes such as PSA, VSA, and TSA (pressure, vacuum and temperature swing adsorption, respectively), reducing cycle time is the primary means of achieving more production from a given quantity of adsorbent. However, as cycle time is reduced, cyclic processes usually face the problem of decreasing working capacity per cycle for the component of interest, decreasing product recovery and increasing pressure drop. The extent to which cycle time reduces working capacity and recovery and increases pressure drop is dependent on the structure of the adsorbent 1-2. Conventional adsorbents for gas separations are usually prepared in the form of beads or granules and these materials are used in packed beds. Mass transfer and pressure drop associated with packed beds of conventional 114PDF Image | Structured Zeolite Adsorbents for PSA Applications
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