Thermophysical properties of phosphonium-based ionic liquids

Abstract

Experimental data for density, viscosity, refractive index and surface tension of four phosphonium-based ionic liquids were measured in the temperature range between (288.15 and 353.15) K and at atmospheric pressure. The ionic liquids considered include tri(isobutyl) methylphosphonium tosylate, [P i(444) . Additionally, derivative properties, such as the isobaric thermal expansion coefficient, the surface thermodynamic properties and the critical temperatures for the investigated ionic liquids were also estimated and are presented and discussed. Group contribution methods were evaluated and fitted to the density, viscosity and refractive index experimental data.

Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

“…The thermal expansion coefficients were found to be quite consistent over the temperature range studied and therefore are considered to be temperature independent. The pattern of the results is consistent with other types of ionic liquids [27,28,36,40,41]. The molecular volume, Vm, of the [BA] ionic liquid was greater than that of [AC] for a fixed cation and this may be attributed to the presence of additional CH2 groups [36,37].…”

“…Precise understanding on the thermophysical properties is important as it is required to evaluate the suitability of ionic liquids to be used at an industrial scale [26]. For instance, viscosity is an important property for the design of industrial processes involving heat and mass transfer and dissolution of compounds in fluids [27]. Therefore, the aim of our work was to synthesize several new ammonium-based protic ionic liquids using a 1-step neutralization reaction, measure their thermophysical properties, and, lastly, test their ability to capture CO 2 .…”

Ionic liquids and deep eutectic solvents for lignocellulosic biomass fractionation

“…40,84,98 The viscosity of an IL widely depends on the combination of cation and anion or impurities present, their effects are well studied in literature. 71,40,84,99,100 For example, the presence of very low concentrations of chloride drastically increases the viscosity, whereas the presence of water significantly reduces the viscosity. 101,102,103,104,105,106 DESs exhibit relatively high viscosities (> 100 mPa•s at ambient temperature).…”

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

“…Currently, growing interest is focused on the use of ILs for high temperature applications, such as thermal fluids and electrolytes for solar cells and fuel cells [9,10]. Significant research has been focused on the thermophysical properties of imidazolium-based ILs [11,12], but there are only a few studies focused on a novel class of ILs based on phosphorous quaternary cations [13,14]. The phosphorus atom allows for bonding with different substituents, giving a great number of different structures and physicochemical properties [15,16].…”