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Diffusivity of carbon dioxide in room - temperature ionic liquids / Surya S. Moganty in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9370–9376 Titre : Diffusivity of carbon dioxide in room - temperature ionic liquids Type de document : texte imprimé Auteurs : Surya S. Moganty, Auteur ; Ruth E. Baltus, Auteur Année de publication : 2010 Article en page(s) : pp. 9370–9376 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Dioxide  Ionic  liquids Résumé : A transient thin liquid film gas uptake technique was used to measure the diffusion coefficients of carbon dioxide under infinite dilution conditions in eight commercially available room-temperature ionic liquids at 10, 25, and 40 °C. The measured CO2 diffusion coefficients were 1 × 10−6 cm2/s, an order of magnitude smaller than coefficients for CO2 diffusion in traditional organic solvents. Combining these results with diffusivity values reported in the literature for CO2 diffusivity in nonionic fluids shows a generally universal relationship between diffusivity and solvent viscosity, with diffusivity inversely proportional to the square root of viscosity. Activation energies for CO2 diffusion in ionic liquids were found to be considerably smaller than activation energies for self-diffusion of ionic liquids (determined from NMR measurements) and activation energies for ionic liquid viscosity. These relative values are different than for CO2 diffusion, self-diffusion and viscosity in traditional nonionic solvents, where activation energy values for the three different processes are generally comparable. Results were used to develop correlations relating CO2 diffusion to ionic liquid properties and system temperature. Different expressions were needed to describe diffusion in ionic liquids with bis(trifluoromethylsulfonyl)imide anion than for ionic liquids with a different anion. Diffusivity values predicted using these correlations agree within 25% with experimentally measured values. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101260j [article] Diffusivity of carbon dioxide in room - temperature ionic liquids [texte imprimé] / Surya S. Moganty, Auteur ; Ruth E. Baltus, Auteur . - 2010 . - pp. 9370–9376. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9370–9376 Mots-clés : Dioxide  Ionic  liquids Résumé : A transient thin liquid film gas uptake technique was used to measure the diffusion coefficients of carbon dioxide under infinite dilution conditions in eight commercially available room-temperature ionic liquids at 10, 25, and 40 °C. The measured CO2 diffusion coefficients were 1 × 10−6 cm2/s, an order of magnitude smaller than coefficients for CO2 diffusion in traditional organic solvents. Combining these results with diffusivity values reported in the literature for CO2 diffusivity in nonionic fluids shows a generally universal relationship between diffusivity and solvent viscosity, with diffusivity inversely proportional to the square root of viscosity. Activation energies for CO2 diffusion in ionic liquids were found to be considerably smaller than activation energies for self-diffusion of ionic liquids (determined from NMR measurements) and activation energies for ionic liquid viscosity. These relative values are different than for CO2 diffusion, self-diffusion and viscosity in traditional nonionic solvents, where activation energy values for the three different processes are generally comparable. Results were used to develop correlations relating CO2 diffusion to ionic liquid properties and system temperature. Different expressions were needed to describe diffusion in ionic liquids with bis(trifluoromethylsulfonyl)imide anion than for ionic liquids with a different anion. Diffusivity values predicted using these correlations agree within 25% with experimentally measured values. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101260j

Regular solution theory for low pressure carbon dioxide solubility in room temperature ionic liquids / Surya S. Moganty in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5846–5853 Titre : Regular solution theory for low pressure carbon dioxide solubility in room temperature ionic liquids : ionic liquid solubility parameter from activation energy of viscosity Type de document : texte imprimé Auteurs : Surya S. Moganty, Auteur ; Ruth E. Baltus, Auteur Année de publication : 2010 Article en page(s) : pp. 5846–5853 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Carbon  dioxide  solubility  Ionic  liquids  Transient  thin  liquid  film  technique Résumé : The low pressure solubility of carbon dioxide in eight commercially available room temperature ionic liquids was measured at 10, 25, and 40 °C using a transient thin liquid film technique. In this paper, carbon dioxide solubility is reported as the Henry’s law constant for each system. Experimental results were interpreted using regular solution theory where Eyring’s reaction rate theory was successfully applied to estimate the solubility parameter of each ionic liquid from its activation energy of viscosity. Consistent with the regular solution theory, the carbon dioxide solubility was found to be inversely proportional to the solubility parameter of the ionic liquid, and Henry’s law constants were successfully correlated with the square of the difference between ionic liquid and carbon dioxide solubility parameters. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901837k [article] Regular solution theory for low pressure carbon dioxide solubility in room temperature ionic liquids : ionic liquid solubility parameter from activation energy of viscosity [texte imprimé] / Surya S. Moganty, Auteur ; Ruth E. Baltus, Auteur . - 2010 . - pp. 5846–5853. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5846–5853 Mots-clés : Carbon  dioxide  solubility  Ionic  liquids  Transient  thin  liquid  film  technique Résumé : The low pressure solubility of carbon dioxide in eight commercially available room temperature ionic liquids was measured at 10, 25, and 40 °C using a transient thin liquid film technique. In this paper, carbon dioxide solubility is reported as the Henry’s law constant for each system. Experimental results were interpreted using regular solution theory where Eyring’s reaction rate theory was successfully applied to estimate the solubility parameter of each ionic liquid from its activation energy of viscosity. Consistent with the regular solution theory, the carbon dioxide solubility was found to be inversely proportional to the solubility parameter of the ionic liquid, and Henry’s law constants were successfully correlated with the square of the difference between ionic liquid and carbon dioxide solubility parameters. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901837k