CO2 solubility into [Emim] [Ac] IL at high pressures and temperatures measured and predicted by using a combination of PR EOS and mixing rule that has not been previously applied for analyzing the CO2 + [Emim] [Ac] IL system. The vapor-liquid equilibria of CO2 in [Emim] [Ac] IL has been investigated experimentally within temperature range of 293.15-363.15 K and pressures of 0.03-60 bar. The bubble point pressures of the binary system were presented for CO2 concentrations of 10.2-52.1 mol%. The density, viscosity and surface tension of pure [Emim] [Ac] IL were measured and the temperature dependency of the properties investigated. The PR EOS with the quadratic mixing rules modified by Adachi and Sugie has been used to analyze the measured vapor liquid equilibria. The given results were compared with previous data reported in the literature. Finally, the regeneration process of [Emim] [Ac] IL showed that complete CO2 desorption is possible.