• Asim K Das

      Articles written in Resonance – Journal of Science Education

    • Quadrupolar Interaction with Zeolite and Pressure Swing Adsorption in Portable Medical Oxygen Concentrators for Breathing of Covid-19 and COPD Patients

      Ankita Das Asim K Das

      More Details Abstract Fulltext PDF

      Pressure swing adsorption (PSA) technology is used in medi­cal oxygen concentrators for selective adsorption of nitrogen under pressure from air to produce oxygen-enriched air for breathing. The functional material in oxygen concentrators is aluminosilicate zeolite like Li-13X, SA (LTA) with a relatively high Al-content. It selectively adsorbs nitrogen from the air into their molecular sieves due to the strong quadrupolar in­teraction between the adsorbed nitrogen and the electrical field of the charge balancing non-framework exchangeable cations of aluminosilicate zeolites. In an oxygen concentra­tor, two adsorbent vessels packed with the zeolite working al­ternately in a cyclic process are used for a near-continuous production of the oxygen-enriched air.

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