| Titre : | Phase equilibrium conditions of tetrabutyl ammonium nitrate + CO2, N2, or CH4 semiclathrate hydrate systems (2011) |
| Auteurs : | Jian-Wei Du, Auteur ; De-Qing Liang, Auteur ; Dong-Liang Li, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 50 N° 20, Octobre 2011) |
| Article en page(s) : | pp. 11720-11723 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | Carbon dioxide Phase equilibrium |
| Résumé : | Phase equilibrium conditions for semiclathrate hydrates formed from tetrabutyl ammonium nitrate (TBANO3) + CO2, N2, or CH4 + water system were investigated under high-pressure in a "full view" sapphire cell. An isochoric equilibrium step-heating pressure-search method was used for the determination of the hydrate phase transition points through plotting the points of intersection of hydrate-liquid-vapor (H-L-V) to liquid-vapor (L-V) experimentally. All the experimental equilibrium data were obtained in the presence of TBANO3 solution at ammonium salt mass fraction of 0.3941 corresponding to a stoichiometric composition for TBANO3·26H2O. Measurements were performed for TBANO3 + CO2 + water, TBANO3 + N2 + water, and TBANO3 + CH4 + water system in the temperature range of (281.5 to 290.9) K and in the pressure range of (1.19 to 32.89) MPa. The three-phase equilibrium lines of TBANO3 + N2 and TBANO3 + CO2 semiclathrate hydrate shifted the hydrate stability region to lower pressure and higher temperature than that of the pure N2 and CO2 hydrate, respectively. However, the addition of TBANO3 made TBANO3 + CH4 semiclathrate hydrate phase equilibrium curve at higher pressure than the pure CH4 hydrate. |
| DEWEY : | 660 |
| ISSN : | 0888-5885 |
| En ligne : | http://cat.inist.fr/?aModele=afficheN&cpsidt=24612398 |
