Thermodynamic properties of binary mixtures of n-butylammonium-based ionic liquids with ethanol at T=(293.15-313.15)K

Author(s)

Bittencourt, Samara Storion ^[1] ; Hoga, Heloisa Emi ^[2] ; Torres, Ricardo Belchior ^[2] ; Hallak d'Angelo, Jose Vicente ^[1]

Affiliation

^[1] Univ Estadual Campinas, Sch Chem Engn, Dept Chem Syst Engn, 500 Albert Einstein Ave, BR-13083852 Campinas, SP - Brazil

^[2] Ctr Univ FEI, Dept Engn Quim, Ave Humberto Alencar Castelo Branco 3972, BR-09850901 Sao Bernardo Do Campo, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 135, n. 4, p. 2519-2539, FEB 2019.
• Web of Science Citations: 1

Abstract

In this study, density, speed of sound and viscosity of binary mixtures of ionic liquids+ethanol have been measured as a function of composition at T=(293.15-313.15)K and atmospheric pressure. The ionic liquids studied were: [n-butylammonium acetate (N4Ace), n-butylammonium propanoate (N4Pro), n-butylammonium hexanoate (N4Hex), and n-butylammonium decanoate (N4Dec)]. Excess molar volume, VmE</mml:msubsup>, deviation in isentropic compressibility, S, deviation in viscosity, , and excess Gibbs energy of activation of viscous flow, GE, were obtained from experimental results and correlated with the Redlich-Kister polynomial equation. Ionic liquids were synthesized and characterized using H-1-NMR, C-13-NMR and FTIR spectroscopy techniques. For all systems studied, the values of VmE, <mml:msub>S and were negative over the entire composition range, whereas GE values were positive over the entire composition range. The results obtained were discussed in terms of structural effects and intermolecular interactions between like and unlike molecules. (AU)

• FAPESP's process: 09/14556-5 - Volumetric, transport, and acoustic properties of binary systems containing ionic liquids: experimental study and modeling
• Grantee: Ricardo Belchior Tôrres
• Support Opportunities: Regular Research Grants