resumo
Experimental density measurements are reported along with the derived thermodynamic properties (isothermal compressibility, isobaric expansivity, and thermal pressure coefficient) for trihexyltetradecylphosphonium-based ionic liquids chloride, bromide, bis(trifluoromethylsulfonyl)imide, dicyanamide and methyl sulfonate-in the pressure range (0.10 to 45.00 MPa) and temperature range (283.15 to 333.15) K The effect of the anion of the ionic liquid on the properties under study was evaluated. Experimental densities were correlated using the Tait equation, the modified cell model equation of state, and the Sanchez-Lacombe equation of state, and compared against the predictive method proposed by Gardas and Coutinho. It is shown that the three correlations describe well all the ILs studied, with the Tait equation providing the lowest average relative deviation (less than 0.004 %) and the Sanchez-Lacombe equation of state the highest (inferior to 0.5 %), and that the predicted densities estimated by Gardas and Coutinho method are in good agreement with the experimental densities determined.
palavras-chave
MODIFIED CELL MODEL; RHO-T MEASUREMENTS; EQUATION-OF-STATE; THERMODYNAMIC PROPERTIES; PHYSICAL-PROPERTIES; ORGANIC-COMPOUNDS; POLYMER LIQUIDS; CARBON-DIOXIDE; TEMPERATURE; IMIDAZOLIUM
categoria
Thermodynamics; Chemistry; Engineering
autores
Tome, LIN; Gardas, RL; Carvalho, PJ; Pastoriza-Gallego, MJ; Pineiro, MM; Coutinho, JAP
nossos autores
Luciana Isabel Nabais Tomé
Bolseiro de pós-Doutoramento
Pedro J. Carvalho
Professor Auxiliaragradecimentos
The authors thank financial support from Fundacao para a Ciencia e a Tecnologia for Project PTDC/EQU FTT/102166/2008 Ph.D. grant (SFRH/BD/41562/2007) of Pedro J. Carvalho and postdoctoral grant SFRH/BPD/44926/2008 of Luciana I. N. Tome.