Documents disponibles écrits par cet auteur

Binary andternaryphasediagrams of benzene, hexafluorobenzene, and ionic liquid [emim][Tf2N] using equations of state / A. Yokozeki in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8389–8395 Titre : Binary andternaryphasediagrams of benzene, hexafluorobenzene, and ionic liquid [emim][Tf2N] using equations of state Type de document : texte imprimé Auteurs : A. Yokozeki, Auteur ; Mark B. Shiflett, Auteur Année de publication : 2008 Article en page(s) : p. 8389–8395 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : System  of  benzeneIonic  liquid,  solubility Résumé : A binary system of benzene and hexafluorobenzene is known as a system with famous double azeotropes (minimum-and-maximum pressure azeotropes at the isothermal VLE (vapor−liquid equilibrium)). In order to understand how these azeotropic behaviors will be affected by interactions with an ionic liquid, solubility experiments for benzene + ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [emim][Tf2N], and hexafluorobenzene + [emim][Tf2N] systems have been carried out at temperatures of about 283, 298, and 318 K. Both binary systems show immisciblity gaps with concentration ranges from about 77 to 100 and from about 66 to 100 mol % for benzene and hexafluorobenzene systems, respectively. The observed solubility data have been used to develop equation-of-state (EOS) models (with a generic Redlich−Kwong cubic equation) for these binary systems. As for the binary system of benzene and hexafluorobenzene, VLE data in the literature have been employed to develop the EOS model. Thus, binary and ternary phase diagrams for the present three components have been constructed using the present binary interaction parameters. Then, extractive separations of the azeotropes are discussed based on the present EOS model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800754u [article] Binary andternaryphasediagrams of benzene, hexafluorobenzene, and ionic liquid [emim][Tf2N] using equations of state [texte imprimé] / A. Yokozeki, Auteur ; Mark B. Shiflett, Auteur . - 2008 . - p. 8389–8395. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8389–8395 Mots-clés : System  of  benzeneIonic  liquid,  solubility Résumé : A binary system of benzene and hexafluorobenzene is known as a system with famous double azeotropes (minimum-and-maximum pressure azeotropes at the isothermal VLE (vapor−liquid equilibrium)). In order to understand how these azeotropic behaviors will be affected by interactions with an ionic liquid, solubility experiments for benzene + ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [emim][Tf2N], and hexafluorobenzene + [emim][Tf2N] systems have been carried out at temperatures of about 283, 298, and 318 K. Both binary systems show immisciblity gaps with concentration ranges from about 77 to 100 and from about 66 to 100 mol % for benzene and hexafluorobenzene systems, respectively. The observed solubility data have been used to develop equation-of-state (EOS) models (with a generic Redlich−Kwong cubic equation) for these binary systems. As for the binary system of benzene and hexafluorobenzene, VLE data in the literature have been employed to develop the EOS model. Thus, binary and ternary phase diagrams for the present three components have been constructed using the present binary interaction parameters. Then, extractive separations of the azeotropes are discussed based on the present EOS model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800754u

Chemical absorption of sulfur dioxide in room-temperature ionic liquids / Mark B. Shiflett in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1370–1377 Titre : Chemical absorption of sulfur dioxide in room-temperature ionic liquids Type de document : texte imprimé Auteurs : Mark B. Shiflett, Auteur ; A. Yokozeki, Auteur Année de publication : 2010 Article en page(s) : pp. 1370–1377 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Chemical--Absorption--Sulfur  Dioxide--Room-Temperature--Ionic--Liquids Résumé : Gaseous solubilities of sulfur dioxide (SO2) in room-temperature ionic liquids (RTILs), 1-n-butyl-3-methylimidazolium acetate and 1-n-butyl-3-methylimidazolium methyl sulfate, have been measured at four isothermal conditions (about 283, 298, 323, and 348 K) using a gravimetric microbalance. The observed pressure−temperature-composition (PTx) data have been analyzed by use of an equation-of-state (EOS) model, which has been successfully applied for our previous works. Excess thermodynamic functions and Henry’s law constants have been obtained from the observed (PTx) data and our previous measurements of SO2 + 1-n-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide using the EOS correlation. All three RTILs show the chemical absorption. The classification of whether the absorption is the physical or chemical type is based on the excess Gibbs and enthalpy functions as well as the magnitude of the Henry’s constant. An ideal association model has been applied in order to interpret those excess thermodynamic functions. Then, two types of the chemical associations (AB and AB2, where A is RTIL and B is SO2) have been observed with the heat of complex formations of about −6 to −19 (for AB) and from −6 to −29 (for AB2) kJ·mol−1, respectively. ISSN : 0888-5885 [article] Chemical absorption of sulfur dioxide in room-temperature ionic liquids [texte imprimé] / Mark B. Shiflett, Auteur ; A. Yokozeki, Auteur . - 2010 . - pp. 1370–1377. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1370–1377 Mots-clés : Chemical--Absorption--Sulfur  Dioxide--Room-Temperature--Ionic--Liquids Résumé : Gaseous solubilities of sulfur dioxide (SO2) in room-temperature ionic liquids (RTILs), 1-n-butyl-3-methylimidazolium acetate and 1-n-butyl-3-methylimidazolium methyl sulfate, have been measured at four isothermal conditions (about 283, 298, 323, and 348 K) using a gravimetric microbalance. The observed pressure−temperature-composition (PTx) data have been analyzed by use of an equation-of-state (EOS) model, which has been successfully applied for our previous works. Excess thermodynamic functions and Henry’s law constants have been obtained from the observed (PTx) data and our previous measurements of SO2 + 1-n-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide using the EOS correlation. All three RTILs show the chemical absorption. The classification of whether the absorption is the physical or chemical type is based on the excess Gibbs and enthalpy functions as well as the magnitude of the Henry’s constant. An ideal association model has been applied in order to interpret those excess thermodynamic functions. Then, two types of the chemical associations (AB and AB2, where A is RTIL and B is SO2) have been observed with the heat of complex formations of about −6 to −19 (for AB) and from −6 to −29 (for AB2) kJ·mol−1, respectively. ISSN : 0888-5885

Water solubility in ionic liquids and application to absorption cycles / A. Yokozeki 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. 9496–9503 Titre : Water solubility in ionic liquids and application to absorption cycles Type de document : texte imprimé Auteurs : A. Yokozeki, Auteur ; Mark B. Shiflett, Auteur Année de publication : 2010 Article en page(s) : pp. 9496–9503 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Absorption  Solubility  water Résumé : The absorption cooling cycle has been in use for more than 100 years. Although the vapor compression cycle is now used for most air-conditioning and refrigeration applications, the well-known refrigerant−absorbent systems (water−LiBr and ammonia−water) are still being used for space cooling and industrial refrigeration. Recently, absorption cooling cycles using water + room-temperature ionic liquids (RTILs) have been proposed as a replacement for the water + LiBr system. There have been a few reports in the literature since about the year 2000 on the solubility of water in RTILs, and some of the hydrophilic RTILs show extremely high mutual solubility with water, indicating formation of chemical complexes. Almost all solubility data have been correlated with the use of activity (or solution) models. In the present report, we apply an equation of state (EOS) model in order to understand the solubility characteristics, as well as the chemical complex formation, consistently with the same thermodynamic model. Also, such a model is convenient for estimating the performance of the absorption cooling cycle, as we have demonstrated in the past for the absorption cycle performance of various hydrofluorocarbons (HFCs) + solvents and ammonia + RTILs. The present purpose is to examine the feasibility of using water and RTILs in an absorption cooling cycle and to show some promising results for this application. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1011432 [article] Water solubility in ionic liquids and application to absorption cycles [texte imprimé] / A. Yokozeki, Auteur ; Mark B. Shiflett, Auteur . - 2010 . - pp. 9496–9503. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9496–9503 Mots-clés : Absorption  Solubility  water Résumé : The absorption cooling cycle has been in use for more than 100 years. Although the vapor compression cycle is now used for most air-conditioning and refrigeration applications, the well-known refrigerant−absorbent systems (water−LiBr and ammonia−water) are still being used for space cooling and industrial refrigeration. Recently, absorption cooling cycles using water + room-temperature ionic liquids (RTILs) have been proposed as a replacement for the water + LiBr system. There have been a few reports in the literature since about the year 2000 on the solubility of water in RTILs, and some of the hydrophilic RTILs show extremely high mutual solubility with water, indicating formation of chemical complexes. Almost all solubility data have been correlated with the use of activity (or solution) models. In the present report, we apply an equation of state (EOS) model in order to understand the solubility characteristics, as well as the chemical complex formation, consistently with the same thermodynamic model. Also, such a model is convenient for estimating the performance of the absorption cooling cycle, as we have demonstrated in the past for the absorption cycle performance of various hydrofluorocarbons (HFCs) + solvents and ammonia + RTILs. The present purpose is to examine the feasibility of using water and RTILs in an absorption cooling cycle and to show some promising results for this application. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1011432