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<p>Fast pressure swing adsorption (FPSA) is an adsorption-based separation process with cycle durations ranging from a few to tens of seconds. While widely used in small-scale oxygen generators, FPSA still holds significant potential for improvement. In this study, we propose and demonstrate a novel rapid vacuum swing adsorption (FVSA) cycle, where adsorption occurs at atmospheric pressure and desorption under vacuum, to enhance small-scale oxygen production from air. A simulated air mixture, containing 78% nitrogen (N<sub>2</sub>), 21% oxygen (O<sub>2</sub>) and 1% argon (Ar), was processed through a dual-column FVSA system using LiLSX zeolite as the adsorbent. A numerical model was developed on Aspen Adsorption and validated against previously reported results. A parametric study was conducted to assess the effects of various operating conditions on separation performance. The results indicate that a low feed flow rate, low desorption pressure, and an optimal length-to-diameter (<i>L/D</i>) ratio improve the separation efficiency. Under operating conditions of 101.1&#xa0;kPa adsorption pressure, 40.3&#xa0;kPa desorption pressure, and a feed rate of 47&#xa0;L/min, the system achieved a 91% O<sub>2</sub> product stream with a 5&#xa0;L/min flowrate and 44% O<sub>2</sub> recovery. Compared to traditional FPSA, FVSA reduced energy consumption by 13% (39.24 vs. 33.99&#xa0;kJ·mol<sup>−1</sup>O<sub>2</sub>) and lowered the air-to-oxygen ratio by 25% (14.4 vs. 10.8) while maintaining comparable O<sub>2</sub> purity, demonstrating its potential for more efficient oxygen production.</p>

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Process simulation and analysis of air separation for oxygen production via fast vacuum swing adsorption

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月7日

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  • Zhi Qi,
  • Bo Ren,
  • Yalou Guo,
  • Chuhan Fu,
  • Jinbiao Luo,
  • Sibin Li,
  • Jianbin Qin,
  • Gang Wang,
  • Tao Qi,
  • Paul Webley,
  • Guoping Hu

摘要

Fast pressure swing adsorption (FPSA) is an adsorption-based separation process with cycle durations ranging from a few to tens of seconds. While widely used in small-scale oxygen generators, FPSA still holds significant potential for improvement. In this study, we propose and demonstrate a novel rapid vacuum swing adsorption (FVSA) cycle, where adsorption occurs at atmospheric pressure and desorption under vacuum, to enhance small-scale oxygen production from air. A simulated air mixture, containing 78% nitrogen (N2), 21% oxygen (O2) and 1% argon (Ar), was processed through a dual-column FVSA system using LiLSX zeolite as the adsorbent. A numerical model was developed on Aspen Adsorption and validated against previously reported results. A parametric study was conducted to assess the effects of various operating conditions on separation performance. The results indicate that a low feed flow rate, low desorption pressure, and an optimal length-to-diameter (L/D) ratio improve the separation efficiency. Under operating conditions of 101.1 kPa adsorption pressure, 40.3 kPa desorption pressure, and a feed rate of 47 L/min, the system achieved a 91% O2 product stream with a 5 L/min flowrate and 44% O2 recovery. Compared to traditional FPSA, FVSA reduced energy consumption by 13% (39.24 vs. 33.99 kJ·mol−1O2) and lowered the air-to-oxygen ratio by 25% (14.4 vs. 10.8) while maintaining comparable O2 purity, demonstrating its potential for more efficient oxygen production.