Simple Prediction of Some Physical Properties of Ionic Liquids: The Residual Volume Approach

A new method for prediction of fundamental physical properties of ionic liquids (ILs) is proposed. The Residual Volume Approach (RVA) allows the estimation of density and Viscosity of unknown ILs, using a simple linear correlation between a Oven property and a newly defined substituent parameter beta(x). The proposed method has been developed for the density estimation of 50 n-alkyl-substituted imidazolium and tetraalkylammonium salts in a homologous series of ILs and has been extended for the estimation of viscosity, which also correlates linearly with the corresponding beta(x). In addition, the parameters beta(X) are temperature and pressure independent, which allows the prediction of these values at any temperature and pressure.