resumo
In this work, mutual solubilities of two [PF6]-based ionic liquids (ILs) with water and their thermophysical properties, namely, melting properties of pure ILs and densities and viscosities of both pure and water-saturated ILs, were determined. The selected Its comprise 1-methyl-3-propylimidazolium and 1-methyl-3-propylpyridinium cations combined with the anion hexafluorophosphate. Mutual solubilities with water were measured in the temperature range from (288.15 to 318.15) K. From the experimental solubility data dependence on temperature, the molar thermodynamic functions of solution, such as Gibbs energy, enthalpy, and entropy of the ILs in water were further derived. In addition, a simulation study based on the COSMO-RS methodology was carried out. For both pure ILs and water-equilibrated samples, densities and viscosities were determined in the temperature interval between (303.15 and 373.15) K. The isobaric thermal expansion coefficients for pure and water-saturated ILs were calculated based on the density dependence on temperature.
palavras-chave
MUTUAL SOLUBILITIES; COSMO-RS; SOLVENT-EXTRACTION; PHASE-BEHAVIOR; THERMODYNAMIC ANALYSIS; BINARY-SYSTEMS; AMINO-ACIDS; EQUILIBRIA; PREDICTION; ALCOHOLS
categoria
Thermodynamics; Chemistry; Engineering
autores
Neves, CMSS; Batista, MLS; Claudio, AFM; Santos, LMNBF; Marrucho, IM; Freire, MG; Coutinho, JAP
nossos autores
Ana Filipa M. Cláudio
Bolseiro de pós-Doutoramento
Catarina Maia Seco Seiça Neves
Investigador Auxiliar
Isabel Maria Delgado Jana Marrucho Ferreira
Professor Catedrático
Mara Guadalupe Freire Martins
Investigador Coordenador
Marta Luísa Salsas Batista
Estudante de doutoramentoGrupos
G4 - Materiais Renováveis e Economia Circular
G5 - Materiais Biomiméticos, Biológicos e Vivos
Projectos
agradecimentos
The authors thank financial support from Fundacao para a Ciencia e a Tecnologia (Projects PTDC/EQU-FTT/65252/2006 and REEQ/515/CTM/2005) and Postdoctoral grant SFRH/BPD/41781/2007 of MGF. The authors also thank Sandra Magina for the operation with the Diamond DSC PerkinElmer.