The solubility of CO2 in a mixed solvent of propylene carbonate (P.C.) with methyldiethanolamine (MDEA) and water was measured at CO2 partial pressure of one atm within the temperature range of 10- 35℃ and at 25℃ over a wide range of CO2 partial pressures. The effect of the miscibihty of P.C. and water in the mixed solvent on the solubility of CO2 was investigated. As a result
immiscible mixed solvent shows significant improvement in absorption of CO2
which can be explained by the chemical equilibrium theory. Appropriate compounding of mixed solvents was determind.