Abstract
In our previous work, a perturbed hard-trimer-sphere equation of state (PHTS EOS) was developed for modeling the phase equilibria of pure ionic liquids (ILs) (M.M. Alavianmehr et al., Ionics 22 (2016) 2447–2459). In this work, we have successfully extended the model to the mixtures of IL + IL and IL + solvent. Two temperature-dependent parameters appearing in the EOS are correlated with two microscopic scaling constants σ, the effective hard-sphere diameter, and ε, the non-bonded interaction energy. The overall average absolute deviation (AAD) of the estimated densities from the literature data using the proposed model with and without non-additivity parameter (λij) was found to be 0.44 and 0.79%, respectively. A modified Enskog equation and rough hard-sphere (RHS) theory are combined with our proposed equation of state to calculate the viscosity coefficient of ionic liquids and their mixtures. Finally, from the results obtained, a linear relation between logarithm of surface tension and viscosity property of ionic liquid was developed.
Highlights
As we know, ionic liquids (ILs) are organic salts that are liquid near room temperature
Theses parameters reflect the hard-core diameter and non-bonded interaction energy between pair-wise trimers, respectively. These parameters were optimized for each ILs and solvents by fitting the proposed model with experimental densities data
We successfully applied the PHTS EOS to the mixture of ILs using alternative corresponding states correlations for two temperature-dependent parameters that appeared in the EOS
Summary
Ionic liquids (ILs) are organic salts that are liquid near room temperature. A perturbed hard-sphere equation of state has been employed to predict the pressure–volume–temperature properties of some pure and mixture of ionic liquids [6,7,8,9].
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