Documents disponibles écrits par cet auteur

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]  in Industrial & 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