The knowledge of the thermophysical properties is essential to develop industrial processes involving ionic liquids (ILs). In the present research, the SAFT-γ group contribution (GC) technique is performed to estimate the density and the second-order thermodynamic derivative properties of some imidazolium-, cyano-based ILs (with either [SCN], [DCA], [TCM] or [TCB] anions). The density and the second-order derivatives including isothermal and isentropic compressibility coefficients, thermal expansion and thermal pressure coefficients, isochoric and isobaric heat capacities, and speed of sound are determined for the mentioned ionic liquids within a temperature range of 262–412 K and at pressures up to 200 MPa. The SAFT-γ predictions of the density and the second-order derivatives are compared with some accessible experimental data. The results demonstrate that the SAFT-γ equation can estimate the thermophysical properties of the studied ILs with good accuracy.

热物理特性的知识对于开发涉及离子液体 (IL) 的工业过程至关重要。在本研究中，使用 SAFT-γ 基团贡献 (GC) 技术来估计一些咪唑基、氰基 IL（具有 [SCN]、[DCA]、[ TCM] 或 [TCB] 阴离子）。密度和二阶导数，包括等温和等熵压缩系数、热膨胀和热压系数、等容和等压热容以及声速是在 262-412 K 的温度范围内确定上述离子液体的，在压力高达 200 兆帕。密度和二阶导数的 SAFT-γ 预测与一些可访问的实验数据进行了比较。