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Separation of CO2/N2 mixture by vacuum pressure swing adsorption (VPSA) using zeolite 13X type and carbon molecular sieve adsorbents

Abstract

Separation of carbon dioxide in flue gases from the combustion equipment is one of the most serious concerns for industries and especially for the power plants which are the main producers of this pollutant gas. From the various separation methods, vacuum pressure swing adsorption (VPSA) process is attracted interest due to its lower energy consumption and high efficiency. A VPSA process was studied for the separation of a mixture of CO2/N2 (80% N2 and 20% CO2). Experiments were performed in an eight-step, four-bed setup using zeolite 13X and carbon molecular sieve (CMS) as adsorbents. Experimental measurements by the bench-scale system have been obtained in a pressure range of 2.7–4.7 bar, cycle times of 360–600 s, the product flow rate of 1–3 (lit/min), and temperature 30 °C. The effects of pressure, cycle time, and product flow rate were investigated. With using 560 s for a cycle time at 3.7 bar, the maximum purity of 97.6% was obtained for zeolite 13X adsorbent.

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Acknowledgements

The authors are grateful to Prof. M. Mofarahi for his valuable assistance during experimental setup commissioning. Financial help from Tarbiat Modares University is also acknowledged.

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Correspondence to Seyed Mojtaba Sadrameli.

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Highlights

• Separation of CO2/N2 mixture has been done by Vapor pressure swing adsorption process (VPSA)

• Two adsorbents namely zeolite 13X type and carbon molecular sieve have been used

• The scale of the setup is a large laboratory scale

• Experiments were performed in an eight-steps, four beds set up

• The maximum purity of 97.6% for zeolite and 76% for CMS were obtained

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Alibolandi, M., Sadrameli, S.M., Rezaee, F. et al. Separation of CO2/N2 mixture by vacuum pressure swing adsorption (VPSA) using zeolite 13X type and carbon molecular sieve adsorbents. Heat Mass Transfer 56, 1985–1994 (2020). https://doi.org/10.1007/s00231-020-02823-y

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  • DOI: https://doi.org/10.1007/s00231-020-02823-y

Keywords

  • Vacuum pressure swing adsorption
  • Carbon dioxide
  • Nitrogen
  • Zeolite 13X
  • CMS