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Rapid pressure swing adsorption for reduction of bed size factor of a medical oxygen concentrator / Siew Wah Chai in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8703-8710 Titre : Rapid pressure swing adsorption for reduction of bed size factor of a medical oxygen concentrator Type de document : texte imprimé Auteurs : Siew Wah Chai, Auteur ; Mayuresh V. Kothare, Auteur ; Shivaji Sircar, Auteur Année de publication : 2011 Article en page(s) : pp. 8703-8710 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Network  hub  Pressure  swing  adsorption Résumé : Reduction of the adsorber size of a medical oxygen concentrator (MOC) employing a generic pressure swing adsorption (PSA) technology is an ongoing research and development activity. The MOC typically produces a 90―93% O2-enriched product gas from ambient air at a rate of ≤ 10 L/minute (LPM) for individual use. A common practice is to reduce the total cycle time (tc, seconds) of the PSA process in order to decrease the bed size factor [BSF, pounds of adsorbent in the PSA unit per ton of contained O2 per day production rate (TPDc)]. Adsorbent columns packed with very small adsorbent particles are used to enhance the adsorption kinetics for rapid PSA cycle operation. An experimental mini-PSA set up was used to measure the performance of a simulated Skarstrom-like PSA cycle using a commercial sample of LiX zeolite as the air separation sorbent. Different adsorbent particle sizes, adsorption pressures, and cycle times were tested. It was experimentally demonstrated that BSF cannot be indefinitely reduced by lowering tc because of finite adsorbate mass transfer and gas-solid heat transfer resistances, as well as column pressure drop during the desorption step. A BSF of ∼25―50 Ibs/TPDc with an O2 recovery of ∼25―35% for production of ∼90% O2 could be achieved by the PSA process using a dry, CO2-free air feed at a pressure of 3-4 atm, an adsorbent particle size of ∼0.35 mm, and a total cycle time of 3―5 s. A novel 'snap on' concept of a truly compact and portable MOC was proposed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346910 [article] Rapid pressure swing adsorption for reduction of bed size factor of a medical oxygen concentrator [texte imprimé] / Siew Wah Chai, Auteur ; Mayuresh V. Kothare, Auteur ; Shivaji Sircar, Auteur . - 2011 . - pp. 8703-8710. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8703-8710 Mots-clés : Network  hub  Pressure  swing  adsorption Résumé : Reduction of the adsorber size of a medical oxygen concentrator (MOC) employing a generic pressure swing adsorption (PSA) technology is an ongoing research and development activity. The MOC typically produces a 90―93% O2-enriched product gas from ambient air at a rate of ≤ 10 L/minute (LPM) for individual use. A common practice is to reduce the total cycle time (tc, seconds) of the PSA process in order to decrease the bed size factor [BSF, pounds of adsorbent in the PSA unit per ton of contained O2 per day production rate (TPDc)]. Adsorbent columns packed with very small adsorbent particles are used to enhance the adsorption kinetics for rapid PSA cycle operation. An experimental mini-PSA set up was used to measure the performance of a simulated Skarstrom-like PSA cycle using a commercial sample of LiX zeolite as the air separation sorbent. Different adsorbent particle sizes, adsorption pressures, and cycle times were tested. It was experimentally demonstrated that BSF cannot be indefinitely reduced by lowering tc because of finite adsorbate mass transfer and gas-solid heat transfer resistances, as well as column pressure drop during the desorption step. A BSF of ∼25―50 Ibs/TPDc with an O2 recovery of ∼25―35% for production of ∼90% O2 could be achieved by the PSA process using a dry, CO2-free air feed at a pressure of 3-4 atm, an adsorbent particle size of ∼0.35 mm, and a total cycle time of 3―5 s. A novel 'snap on' concept of a truly compact and portable MOC was proposed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346910