Correlating ionic liquids density over wide range of temperature and pressure by volume shift concept

摘要: Abstract The main purpose of this paper is the use conventional Peng–Robinson equation state (PR EoS) and concept volume shift to correlate predict pure ionic liquids (ILs) density in a wide range temperature pressure. A total number 67 ILs (5020 data points) including different cations anions were used study over pressure 273.15–473.15 K 0.1–205 MPa. At first, parameter ( c ) any optimized using genetic algorithm. An similar Gardas Coutinho (R. L. Gardas, J. A. P. Coutinho, Fluid Phase Equilibr. 263 (2008) 26–32) was for finally generalized correlation proposed as function temperature, critical molar volume. This also predicting densities eight new not included section it able improve PR EoS prediction reducing error with respect experimental data. Considering importance engineering, simple VTPR improves calculation, saves time increases accuracy engineering design. average absolute percent deviation (AAPD) translated (VTPR) equal 2.19% 12.98%, respectively.