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COMPARISON OF TRADITIONAL AND STRUCTURED ADSORBENTS FOR CO2 SEPARATION BY VACUUM SWING ADSORPTION Fateme Rezaei1, Alessandra Mosca2, Paul Webley1*, Jonas Hedlund2, Penny Xiao1 1Department of Chemical Engineering, Monash University, VIC 3800, Australia 2Division of Chemical Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden Abstract Development of structured adsorbents with attractive characteristics is an important step in the improvement of adsorption based gas separation processes. The improved features of structured adsorbents include lower energy consumption, higher throughput and superior recovery and purity of product due to the even flow distribution, very low mass transfer resistance and low pressure drop in combination with reasonable adsorption capacity. This study examines the vacuum swing adsorption (VSA) - CO2 separation performance of structured adsorbents in the form of thin NaX films grown on the walls of ceramic cordierite monoliths and the results are compared with NaX pellets. Adsorption equilibrium and dynamic properties are explored experimentally. The CO2 breakthrough front for the NaX film grown on the 400 cells per square inch monolith was close to ideal and indicated that axial dispersion was very small and that the mass transfer resistance in the film was very low. The breakthrough front for the structured adsorbent with 400 cells per square inch was sharper than that for the structured adsorbent with 900 cells per square inch and only shifted to shorter breakthrough times due to the lower amount of zeolite and higher effective diffusivity of the former sample. In addition, the CO2 breakthrough fronts for the 400 or 900 cells per square inch structured adsorbents were both sharper than the breakthrough front for NaX beads. This indicates that the flow distribution in the structured adsorbents is more even 1Telephone: +61 3 9905 3445 Facsimile: +61 3 9905 5686 E-mail: paul.webley@eng.monash.edu.au 113PDF Image | Structured Zeolite Adsorbents for PSA Applications
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