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The role of water on postcombustion CO2 capture by vacuum swing adsorption: Bed layering and purge to feed ratio

Authors

  • Gang Li,

    1. Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC), Dept. of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, VIC, Australia
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  • Penny Xiao,

    1. Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC), Dept. of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, VIC, Australia
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  • Jun Zhang,

    1. Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC), Dept. of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, VIC, Australia
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  • Paul A. Webley,

    Corresponding author
    1. Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC), Dept. of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, VIC, Australia
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  • Dong Xu

    1. Energy Innovation Technology Research Center, 2 Street, Future Science & Technology Park North, Beijing, China
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Abstract

The influence of water vapor on the adsorption of CO2 in carbon capture by vacuum swing adsorption (VSA) was described. VSA experiments with single and multilayered columns using alumina and zeolite 13X were conducted to understand the migration of water. The penetration depth of water in the column could be controlled by maintaining the purge-to-feed ratio above a critical value. At high water content in the feed (>4%), employment of a water adsorbing prelayer was essential to prevent failure of the carbon capture process. A simple axial working capacity model predicts the penetration depth of water in the column for a given feed temperature and adsorption isotherm, and the layering ratio can be selected accordingly. Although water is detrimental to CO2 capture with polar adsorbents, long-term recovery of CO2 is still possible by appropriate layering and ensuring an adequate purge-to-feed ratio. © 2013 American Institute of Chemical Engineers AIChE J 60: 673–689, 2014

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