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

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      https://www.ias.ac.in/article/fulltext/reso/027/08/1387-1409

    • Keywords

       

      Pressure swing adsorption (PSA), oxygen concentrators, covid-19, aluminosilicate zeolite, Li-13X, molecular sieves, non-framework cations, quadrupole moment, quadrupolar interaction.

    • Abstract

       

      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.

    • Author Affiliations

       

      Ankita Das1 Asim K Das2

      1. School of Chemical Sciences Indian Association of Cultivation for the Science Kolkata 32, India.
      2. Department of Chemistry Visva Bharati Santiniketan 731 235, India.
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