Surface Tension and Density of Ionic Liquid n-Butylpyridinium Heptachlorodialuminate

Abstract

An ionic liquid (IL), [C 4 Py][Al 2 Cl 7 ] (n-butylpyridinium heptachlorodialuminate), was prepared, and its density and surface tension were measured under dry argon in the temperature range from (298.15 to 333.15) K. The experimental data showed that the E€ otv€ os equation was applicable to the IL and the experimental parachor value was larger than that calculated from neutral parachor contribution which did not consider the Coulomb interaction in IL. In terms of Glasser's theory, the molar entropy, S 0 , and the lattice energy, U POT , were estimated. Using Kabo's method the molar enthalpy of vaporization Δ l g H m 0 (298 K) and using the interstice model the thermal expansion coefficient, R, for [C 4 Py][Al 2 Cl 7 ] were predicted, respectively.

Key Applications and Potential Limitations of Ionic Liquid Membranes in the Gas Separation Process of CO2, CH4, N2, H2 or Mixtures of These Gases from Various Gas Streams

“…Their most valuable and distinguishable physicochemical properties include the following: low melting point (m.p. < 100 °C), high thermal stability, insignificant vapour pressure, a low surface tension [ 47 ], high electrical conductivity, a wide electrochemical window [ 48 , 49 , 50 ], and an adjustable solvent viscosity and/or hydrophobicity and/ or polarity associated with high or low water miscibility [ 51 ]. In the separation techniques, the most crucial parameters are the ionic liquid melting point, viscosity, thermal stability, vapour pressure and solvent properties [ 52 ].…”

Density of Three Bis(trifluoromethylsulfonyl) Imide Anion-Based Ionic Liquids. High-Pressure Measurement and Estimation Using Group Contribution Methods

“…Among these research studies, ionic liquids (ILs) have emerged as potential candidates to replace volatile solvents commonly used in many industrial applications. ILs could be defined as salts with melting points usually below room temperature, formed by organic cations and organic/inorganic anions, with fascinating properties such as a low melting point, negligible vapor pressure, a wide temperature range in the liquid state, and non-flammability. − Nevertheless, because of the interaction of cation and anion structures, physicochemical properties should be determined − to know how intermolecular forces are affected by pressure and temperature.…”

Ionic Parachor and Its Application II. Ionic Liquid Homologues of 1-Alkyl-3-methylimidazolium Propionate {[Cnmim][Pro] (n = 2–6)}

“…In recent years, there has been a developing trend in the literature toward the estimation of the physicochemical properties for ILs by semiempirical methods. − Although these estimated results cannot be regarded as accurate physicochemical data, this approach is recommended because it provides valuable insight into the behavior of materials. Among all of the semiempirical methods, parachor is the simplest. ,− The parachor, P , is a relatively old concept that is available as a link between the structure, density, and surface tension of the liquids. However, the vast majority of parachor studies have focused on the uncharged compounds. , The parachor data obtained from the neutral molecule are difficult to be applied to an IL because there is no consideration of the Coulomb force between ions.…”