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Evaporative cooling of water in a rotating packed bed (Split Packing) / Bhattacharya, S. in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 847–851 Titre : Evaporative cooling of water in a rotating packed bed (Split Packing) Type de document : texte imprimé Auteurs : Bhattacharya, S., Auteur ; Mondal, A., Auteur ; Bhowal, A., Auteur Année de publication : 2010 Article en page(s) : pp 847–851 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Rotating  packed  bed  Mass-transfer  processes. Résumé : Rotating packed beds (RPB) have been studied for intensifying mass-transfer processes. This work was undertaken to evaluate the thermal performance of an RPB with split packing for evaporative cooling of water involving simultaneous heat and mass transfer. Higher efficiency was achieved within a smaller contactor volume compared to mechanical draft cooling towers. At all values of the liquid-to-air flow rate ratio studied, efficiency was not significantly affected by rotor speed and decreased with increasing rotor speed beyond a certain limit at low air and water flow rates. A simple mathematical model was used to estimate process parameters from the experimental data based on the Merkel assumption. The hGa/kYaCs ratio varied between 0.85 and 1.18, and the tower characteristic of the RPB was between 1.4 and 4.0. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901207m [article] Evaporative cooling of water in a rotating packed bed (Split Packing) [texte imprimé] / Bhattacharya, S., Auteur ; Mondal, A., Auteur ; Bhowal, A., Auteur . - 2010 . - pp 847–851. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 847–851 Mots-clés : Rotating  packed  bed  Mass-transfer  processes. Résumé : Rotating packed beds (RPB) have been studied for intensifying mass-transfer processes. This work was undertaken to evaluate the thermal performance of an RPB with split packing for evaporative cooling of water involving simultaneous heat and mass transfer. Higher efficiency was achieved within a smaller contactor volume compared to mechanical draft cooling towers. At all values of the liquid-to-air flow rate ratio studied, efficiency was not significantly affected by rotor speed and decreased with increasing rotor speed beyond a certain limit at low air and water flow rates. A simple mathematical model was used to estimate process parameters from the experimental data based on the Merkel assumption. The hGa/kYaCs ratio varied between 0.85 and 1.18, and the tower characteristic of the RPB was between 1.4 and 4.0. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901207m

Liquid−liquid extraction in a rotating-spray column / D. Bonam in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7687–7693 Titre : Liquid−liquid extraction in a rotating-spray column : removal of Cr(VI) by aliquat 336 Type de document : texte imprimé Auteurs : D. Bonam, Auteur ; G. Bhattacharyya, Auteur ; Bhowal, A., Auteur Année de publication : 2009 Article en page(s) : pp. 7687–7693 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Liquid−liquid  extraction  Rotating-spray  column  Interfacial  chemical  reaction Résumé : The effect of centrifugal force on mass-transfer rates in liquid−liquid extraction was investigated experimentally in a rotating-spray column. Extraction with interfacial chemical reaction was studied in this contactor by countercurrent contact of a dilute aqueous solution of hexavalent chromium (pH 2) with an extractant—Aliquat 336 (quaternary ammonium salt)—dissolved in kerosene (dispersed phase). The overall volumetric mass-transfer coefficient, based on a continuous phase (assuming plug flow of the phases), was measured to be an order higher than that in a conventional spray column. A mathematical model was developed for this contactor, considering axial dispersion in the continuous phase and internal circulation within drops. Simulation results suggested that the variation of kca, relative to the flow rate of the aqueous phase, was not significant at a constant rotor speed and a constant flow rate of the organic phase. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900012k [article] Liquid−liquid extraction in a rotating-spray column : removal of Cr(VI) by aliquat 336 [texte imprimé] / D. Bonam, Auteur ; G. Bhattacharyya, Auteur ; Bhowal, A., Auteur . - 2009 . - pp. 7687–7693. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7687–7693 Mots-clés : Liquid−liquid  extraction  Rotating-spray  column  Interfacial  chemical  reaction Résumé : The effect of centrifugal force on mass-transfer rates in liquid−liquid extraction was investigated experimentally in a rotating-spray column. Extraction with interfacial chemical reaction was studied in this contactor by countercurrent contact of a dilute aqueous solution of hexavalent chromium (pH 2) with an extractant—Aliquat 336 (quaternary ammonium salt)—dissolved in kerosene (dispersed phase). The overall volumetric mass-transfer coefficient, based on a continuous phase (assuming plug flow of the phases), was measured to be an order higher than that in a conventional spray column. A mathematical model was developed for this contactor, considering axial dispersion in the continuous phase and internal circulation within drops. Simulation results suggested that the variation of kca, relative to the flow rate of the aqueous phase, was not significant at a constant rotor speed and a constant flow rate of the organic phase. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900012k