Developing models for correlating ionic liquids density: Part 1 – Density at 0.1MPa

Molar volume of eutectic solvents as a function of molar composition and temperature

“…More general predictive models involve molecular structure parameters like group contributions [16][17][18][19] or based on the corresponding state principle [7]. However, the previous methods are more suitable to molecular liquids and usually do not perform well for ionic liquids and their analogues [16].…”

“…However, the previous methods are more suitable to molecular liquids and usually do not perform well for ionic liquids and their analogues [16]. Thermodynamic methods based on the critical properties have shown reasonable success in predicting the molar volume of these liquids [17]. An example of such models is the Rackett model [20][21][22].…”

Developing models for correlating ionic liquids density: Part 2 – Density at high pressures

“…Recently, this paper's authors have presented a correlation that is able to estimate ILs density at pressure of 0.1 MPa with average absolute percent deviation (AAPD) of 0.83 for 40 different ILs [9]. Actually it was a modification of Rackett [12] equation and was based on the observed linear relation of logarithm of reduced volume with respect to reduced temperature for all considered ILs.…”

“…Actually it was a modification of Rackett [12] equation and was based on the observed linear relation of logarithm of reduced volume with respect to reduced temperature for all considered ILs. For calculating the compressed volume of ILs it is necessary to use an appropriate model at 0.1 MPa, so we applied the modified Rackett [9] correlation due to its good accuracy. Moreover, it should be noted that the adjustable parameters of modified Rackett [9] correlation has been optimized for ILs considered in this study.…”

“…Two forms of correlations are presented for calculating ILs density and deviations from experimental data is evaluated. Two proposed models make use of recent modified Rackett correlation for ILs density at 0.1 MPa reported by authors [9]. In other words, to consider the effect of pressure on IL volume, two methods are used.…”