Solubility of Carbon Dioxide in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane

The solubilities of carbon dioxide are reported in mixed solvents containing (1.68 to 3.00) kmol/m 3 ( N -methyldiethanolamine), (0.36 to 1.36) kmol/m 3 (piperazine), (0.36 to 1.36) kmol/m 3 (tetramethylensulfone or sulfolane), and water for temperatures from (40 to 70) °C and CO 2 partial pressures in the range of (30 to 3900) kPa. The results show that piperazine has an effect on the CO 2 solubility and sulfolane behaves as a physical solvent.