A group contribution procedure, on the basis of SAFT-γ equation, is extended to cover new families of imidazolium-based ionic liquids (ILs), with either the [MeSO₃], [MeSO₄], [EtSO₄] or [CF₃SO₃] anions. The IL groups of the SAFT-γ equation were fit to IL density data at temperatures from 293.15 to 393.15 K. Pressures varied up to 60 MPa. The groups corresponding to the CO₂+IL systems were optimized by the solubility data of CO₂ in the ILs. The binary system data covered temperatures from 273.15 to 413.15 K, with pressures going up 27 MPa. In addition to the accuracy of estimations, the strength of SAFT-γ in predictions was investigated by estimating both the density of ILs, and the bubble-point pressures for some mixtures of CO₂+ILs which were not considered in the fitting process. The average absolute relative deviations in density and bubble pressure predictions did not exceed 2.78% and 4.97%, respectively.

基于SAFT-γ方程的基团贡献程序已扩展为覆盖新的咪唑基离子液体（ILs）系列，包括[MeSO ₃ ]，[MeSO ₄ ]，[EtSO ₄ ]或[CF ₃ SO ₃ ]阴离子。SAFT-γ方程的IL组适合于293.15至393.15 K温度下的IL密度数据。压力变化高达60 MPa。对应于CO基团₂ + IL系统由CO的溶解度数据优化₂在IL中。二元系统数据涵盖了从273.15到413.15 K的温度，压力上升了27 MPa。除了估算的准确性外，还通过估算拟合过程中未考虑的IL ₂密度和某些CO ₂ + IL混合物的泡点压力来研究SAFT-γ在预测中的强度。密度和气泡压力预测的平均绝对相对偏差分别不超过2.78％和4.97％。