Physical Properties of N-Butylpyridinium Tetrafluoroborate and N-Butylpyridinium Bis(trifluoromethylsulfonyl)imide Binary Ionic Liquid Mixtures

Abstract

The use of the N-butylpyridinium tetrafluoroborate ([bpy][BF 4 ]) + N-butylpyridinium bis(trifluoromethylsulfonyl)imide ([bpy][Tf 2 N]) binary ionic liquid mixture as an aromatic extraction solvent has recently been proposed. To establish the potential of this mixture to be applied in an aromatic separation process, its physical properties must be measured. In this work, refractive indices, densities, and viscosities of this binary ionic liquid mixture have been determined over the temperature range from (303.15 to 353.15) K at atmospheric pressure. A comparison between the physical properties of the sulfolane and the properties gathered in this work has also been performed. The Bingham mixing rule has successfully estimated the viscosities of the IL mixtures from viscosity data of pure ILs. The accuracy of the group contribution method proposed by Ye and Shreeve and extended by Gardas and Coutinho in predicting densities of pyridinium-based IL mixtures has been studied. Refractive index deviations, excess molar volumes, and viscosity deviations have been correctly fitted to Redlich−Kister polynomial equations.

Electronic Effects in Organic Chemistry

“…Carbenes have also been known since the late 1990s to form adducts with CO 2 (Fig. Rogers and coworkers could isolate the forming species [112] which was indeed in accordance with the expected products according to the NMR spectra and the X-ray crystallography. Rogers and coworkers could isolate the forming species [112] which was indeed in accordance with the expected products according to the NMR spectra and the X-ray crystallography.…”

“…10 O. The formation of the acetic acid-acetate complex has been clearly demonstrated in the X-ray structure obtained from the product of the subsequent carbene trapping experiment with CO 2 [112] (see below for details). The formation of the acetic acid-acetate complex has been clearly demonstrated in the X-ray structure obtained from the product of the subsequent carbene trapping experiment with CO 2 [112] (see below for details).…”

Thermal stability and specific heats of {[bpy][BF4] + [bpy][Tf2N]} and {[bpy][BF4] + [4bmpy][Tf2N]} mixed ionic liquid solvents

“…In addition to extractive properties, the behavior of physical properties for IL mixtures, such as density and viscosity, has been also evaluated previously [13,14,18,19]. In the case of density, an ideal behavior of mixture was also found, with the group contribution method of Ye and Shreeve and that extended by Gardas and Coutinho being a good tool to predict densities of binary mixtures of ILs [20,21].…”

“…However, as seen in our previous works, it was also useful to the cases of pyridinium-based IL mixtures and under the presence of four different ions. Specifically [18,19]. Similarly, viscosities have shown a certain ideal behavior in most of the IL mixtures evaluated with the utilization of different mixing rules as GrunbergNissan or Bingham [22,23].…”

“…Excess specific heats were also calculated in order to evaluate the ideality of mixture, whereas Redlich-Kister polynomial expansion model was employed to properly correlate this excess magnitude [36]. Redlich-Kister polynomial expansion model showed its effectiveness in the correlation of several excess properties b Temperature that provides a mass loss equal to 1 % of the initial mass introduced c Temperature that provides a mass loss equal to 10 % of the initial mass introduced d Temperature that provides a mass loss equal to 50 % of the initial mass introduced as excess molar volumes, deviations of viscosity from the ideality, or excess specific heats in previous works [18,19,24,25].…”