Measurements of hydrate dissociation temperature of methane, ethane, and CO2 in the absence of any aqueous phase and prediction with the cubic plus association equation of state / Z. Youssef in Industrial & engineering chemistry research, Vol. 48 N° 8 (Avril 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 4045–4050 Titre : Measurements of hydrate dissociation temperature of methane, ethane, and CO2 in the absence of any aqueous phase and prediction with the cubic plus association equation of state Type de document : texte imprimé Auteurs : Z. Youssef, Auteur ; A. Barreau, Auteur ; P. Mougin, Auteur Année de publication : 2009 Article en page(s) : pp. 4045–4050 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas hydrate formation Equilibrium cell Water measurement Karl Fischer coulometer Résumé : Gas hydrate formation is undesired in processing and gas distribution. Therefore, it is important to have a thermodynamic model that predicts correctly gas hydrate formation. Hydrate formation is very well studied in the literature in the presence of liquid water, and hydrate thermodynamic models predict correctly its formation. However, only very little information can be found concerning gas hydrate formation without an aqueous phase. A new experimental procedure combining an equilibrium cell with a water measurement by a Karl Fischer coulometer was developed. The water content of the vapor phase is measured as a function of the temperature, and the hydrate dissociation temperature is determined by the slope change of the curve. In the first step, the dissociation temperatures of methane hydrate, ethane hydrate, and carbon dioxide hydrate were determined at different pressures and for different water amounts. In the second step, the obtained results were compared with the literature data and with the calculated values using the classical Platteeuw and van der Waals model associated with the Soave−Redlich−Kwong and the cubic plus association equations of state to calculate the water fugacity in the vapor phase. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801351e [article] Measurements of hydrate dissociation temperature of methane, ethane, and CO2 in the absence of any aqueous phase and prediction with the cubic plus association equation of state [texte imprimé] / Z. Youssef, Auteur ; A. Barreau, Auteur ; P. Mougin, Auteur . - 2009 . - pp. 4045–4050. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 4045–4050 Mots-clés : Gas hydrate formation Equilibrium cell Water measurement Karl Fischer coulometer Résumé : Gas hydrate formation is undesired in processing and gas distribution. Therefore, it is important to have a thermodynamic model that predicts correctly gas hydrate formation. Hydrate formation is very well studied in the literature in the presence of liquid water, and hydrate thermodynamic models predict correctly its formation. However, only very little information can be found concerning gas hydrate formation without an aqueous phase. A new experimental procedure combining an equilibrium cell with a water measurement by a Karl Fischer coulometer was developed. The water content of the vapor phase is measured as a function of the temperature, and the hydrate dissociation temperature is determined by the slope change of the curve. In the first step, the dissociation temperatures of methane hydrate, ethane hydrate, and carbon dioxide hydrate were determined at different pressures and for different water amounts. In the second step, the obtained results were compared with the literature data and with the calculated values using the classical Platteeuw and van der Waals model associated with the Soave−Redlich−Kwong and the cubic plus association equations of state to calculate the water fugacity in the vapor phase. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801351e

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Measurements of liquid−liquid equilibria for a methanol + glycerol + methyl oleate system and prediction using group contribution statistical associating fluid theory / A. Barreau in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5800–5807 Titre : Measurements of liquid−liquid equilibria for a methanol + glycerol + methyl oleate system and prediction using group contribution statistical associating fluid theory Type de document : texte imprimé Auteurs : A. Barreau, Auteur ; I. Brunella, Auteur ; Jean-Charles de Hemptinne, Auteur Année de publication : 2010 Article en page(s) : pp. 5800–5807 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ternary system Vapor−  liquid−  liquid dataFatty acid methyl ester Glycerol Methanol ternary Résumé : A good understanding and prediction of the phase equilibrium of the fatty acid methyl ester (FAME) + glycerol + methanol ternary system is needed to design and optimize the separation unit of the biodiesel production process. In this work, new experimental vapor−liquid−liquid data on the ternary system have been measured at temperatures between 333.15 and 473.15 K. In addition, new data have been gathered on the methanol + glycerol [vapor−liquid equilibrium (VLE)] and methanol + methyl oleate (VLE and liquid−liquid equilibrium) binary systems. A group contribution method combined with a statistical associating fluid theory equation of state (GC-PPC-SAFT) proposed earlier by our group (Tamouza, S., Passarello, J.-P., Tobaly, P., and de Hemptinne, J.-C.Group contribution method with SAFT EOS applied to vapor liquid equilibria of various hydrocarbons series. Fluid Phase Equilib. 2004, 222−223, 67−76) and recently extended to predict VLE of heavy esters and their mixtures (Nguyen Huynh, D., Falaix, A., Passarello, J.-P., Tobaly, P., and de Hemptinne, J.-C.Predicting VLE of heavy esters and their mixtures using GC-SAFT. Fluid Phase Equilib. 2008, 264, 184−200) is here applied to model vapor liquid−liquid equilibria of methanol + glycerol + methyl oleate. The SAFT parameters for the glycerol pure component have been regressed using two association schemes (4C and 3X2B). The dispersive binary interaction parameters kij have been regressed on the binary systems. The group contribution scheme was used for predicting the ester properties. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901379x [article] Measurements of liquid−liquid equilibria for a methanol + glycerol + methyl oleate system and prediction using group contribution statistical associating fluid theory [texte imprimé] / A. Barreau, Auteur ; I. Brunella, Auteur ; Jean-Charles de Hemptinne, Auteur . - 2010 . - pp. 5800–5807. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5800–5807 Mots-clés : Ternary system Vapor−  liquid−  liquid dataFatty acid methyl ester Glycerol Methanol ternary Résumé : A good understanding and prediction of the phase equilibrium of the fatty acid methyl ester (FAME) + glycerol + methanol ternary system is needed to design and optimize the separation unit of the biodiesel production process. In this work, new experimental vapor−liquid−liquid data on the ternary system have been measured at temperatures between 333.15 and 473.15 K. In addition, new data have been gathered on the methanol + glycerol [vapor−liquid equilibrium (VLE)] and methanol + methyl oleate (VLE and liquid−liquid equilibrium) binary systems. A group contribution method combined with a statistical associating fluid theory equation of state (GC-PPC-SAFT) proposed earlier by our group (Tamouza, S., Passarello, J.-P., Tobaly, P., and de Hemptinne, J.-C.Group contribution method with SAFT EOS applied to vapor liquid equilibria of various hydrocarbons series. Fluid Phase Equilib. 2004, 222−223, 67−76) and recently extended to predict VLE of heavy esters and their mixtures (Nguyen Huynh, D., Falaix, A., Passarello, J.-P., Tobaly, P., and de Hemptinne, J.-C.Predicting VLE of heavy esters and their mixtures using GC-SAFT. Fluid Phase Equilib. 2008, 264, 184−200) is here applied to model vapor liquid−liquid equilibria of methanol + glycerol + methyl oleate. The SAFT parameters for the glycerol pure component have been regressed using two association schemes (4C and 3X2B). The dispersive binary interaction parameters kij have been regressed on the binary systems. The group contribution scheme was used for predicting the ester properties. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901379x

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire