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The Role of Pressure Drop on Rapid Pressure Swing Adsorption Performance Aaron Moran, and Orhan Talu Ind. Eng. Chem. Res., Just Accepted Manuscript • Publication Date (Web): 25 Apr 2017 Downloaded from http://pubs.acs.org on April 25, 2017
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Industrial & Engineering Chemistry Research
The Role of Pressure Drop on Rapid Pressure Swing Adsorption Performance Aaron Moran* and Orhan Talu Department of Chemical and Biomedical Engineering, Cleveland State University, Cleveland, Ohio, 44115, United States *Email:
[email protected] 1 ACS Paragon Plus Environment
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ABSTRACT: A loss in process performance for rapid pressure swing adsorption processes at high cycling frequencies is typically associated with an increase in pressure drop and mass and heat transfer resistances. An experimental study was performed to isolate the effect of pressure drop on process performance using particles ~0.5 mm in diameter. The results demonstrate column pressure drop has a negligible effect on process performance in the flow regime where Darcy’s law holds. They also suggest within our operational range, it is more advantageous to operate with a long, thin column as opposed to a short, wide column. A brief simulation study was also conducted to support the experimental results. It confirmed pressure drop effects were minimal, leaving mass and heat transfer resistances as more logical causes of performance decline with increasing cyclic frequency in this study. However, further research is needed to extend these conclusions to much smaller particles. Keywords: Rapid pressure swing adsorption, pressure drop, LiLSX Zeolite, portable oxygen concentrator
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Industrial & Engineering Chemistry Research
1. INTRODUCTION Rapid pressure swing adsorption (RPSA) is an advancement of PSA technology for the purpose of process size reduction. It is typically distinguished from traditional PSA by rapid cycling (< 30 seconds) of small adsorbent particles (< 1 mm). Cycle time reduction requires an increase in gas velocity for a given amount of adsorbent. This raises several issues such as sorbent fluidization, increase in column pressure drop, and higher gas dispersion.1 In addition, a higher gas velocity reduces contact time with the solid, necessitating smaller adsorbent particles (
