Pressure-Swing Adsorption Using Layered Adsorbent Beds with Different Adsorption Properties: I—Results of Process Simulation |
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Authors: | Yaping Lü Shain-Jer Doong Martin Bülow |
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Institution: | (1) BOC Process Gas Solutions Technology, 100 Mountain Avenue, Murray Hill, NJ 07974, USA;(2) Gas Technology Institute, 1700 South Mount Prospect Road, Des Plaines, IL 60018, USA;(3) BOC Process Gas Solutions Technology, 100 Mountain Avenue, Murray Hill, NJ 07974, USA |
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Abstract: | A simulation study was conducted on layered-bed pressure-swing adsorption, PSA, processes with adsorbents that differ in their adsorption properties. As an example, an oxygen, O2, vacuum-swing adsorption, VSA, process was analyzed to investigate relationships between process performance and adsorption properties of the adsorbents used. For two adsorbents with identical nitrogen-to-oxygen, N2/O2, selectivity but different N2 and O2 capacities, placing the high-capacity adsorbent at the product end and the low-capacity adsorbent at the feed end of the adsorption bed gives a better performance than the case of reversing layering of these adsorbents. However, for two adsorbents with different values of N2/O2 selectivity but identical N2 capacity, changing the bed-layer configuration does not show a significant difference in O2-VSA performance. The advantages of layering a high-capacity adsorbent on product end of the bed are demonstrated by an examination of the N2-loading difference in a VSA cycle. The modeling study also reveals an effect of cycle features (e.g., equalization step) on the effectiveness of using layered-bed configurations in VSA/PSA processes. It suggests that layering appropriately two adsorbents with different adsorption properties could result in better VSA/PSA-process performance than using a single-layer bed with either of the two adsorbents. |
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Keywords: | VSA/PSA processes performance simulation layered beds positioning of adsorbents variation in capacity and selectivity |
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