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- W3142201117 abstract "Conventional gas separation processes using packed beds of beads or granules suffer from high pressure drop and mass transfer resistance when higher throughputs arerequired, leading to lower productivity and recovery and higher power consumption. Thisrestricts the adsorption processes using traditional adsorbents in the form of beads orgranules to low throughputs and makes such processes less attractive compared to otherprocesses such as distillation for large volume production and high productivity. Suchproblems could be reduced if structured adsorbents are developed and replace thetraditional beds of beads or granules.Although much research has been devoted to the development of structuredadsorbents over the last decade, there is still a need to increase the understanding ofstructured adsorbents. Therefore, this work aimed to increase the fundamentalunderstanding of structured adsorbents using two different approaches; a generalapproach by which numerical models were developed to predict the performance ofstructured adsorbents with different geometries in pressure/vacuum swing adsorption(PSA/VSA) processes. The effects of parameters such as porosity, density and surfacearea on the performance of structured adsorbents with different geometries wereevaluated. Comparisons based on mass and heat transfer, adsorbent loading and pressuredrop characteristics of PSA systems for COz/N2 separation were carried out. The obtainedresults demonstrate the potential advantage of structured adsorbents in rapid cycleadsorption processes. The even flow distribution, very low mass and heat transferresistances and low pressure drop in combination with considerable adsorption capacityin the best structured adsorbents indicate that these novel configurations are promisingadsorbents for advanced PSA/VSA applications. In another part of the general approach,the optimization procedure for the structure of gas adsorbents at the pore-scale level wasperformed taking into account the effects of pore geometry, porosity and size on ultimateworking capacity of adsorbents used in a PSA system. As a most remarkable finding oftheoretical results by this optimization technique, the branched structure with a porosityof less than 50% represents the optimum structure with higher working capacity.Furthermore, at faster cycles the advantage of a branched structure is more obviousindicating its ability in reducing diffusion limitations more efficiently than otherstructures.The second approach was to evaluate the performance of zeolite coated monolithsprepared and tested experimentally by numerical modelling. The effects of wall porosity,channel width distribution and zeolite film thickness on the dynamic behavior of theadsorbents were examined. The model indicated that the film thickness could beincreased up to about 10 Ilm to increase adsorption capacity without increasing thedispersion in the system further. In addition, it was shown that employment of monolithswith lower wall porosity would lead to better performance of the structured adsorbents." @default.
- W3142201117 created "2021-04-13" @default.
- W3142201117 creator A5023909392 @default.
- W3142201117 date "2017-02-09" @default.
- W3142201117 modified "2023-09-23" @default.
- W3142201117 title "Optimization of structured adsorbents for gas separation processes" @default.
- W3142201117 doi "https://doi.org/10.4225/03/589c0079a9780" @default.
- W3142201117 hasPublicationYear "2017" @default.
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