The solubilities of carbon dioxide in mixed solvents were mesured at 40, 60, and 80℃ and at partial pressure range of carbon dioxide up to 2500kPa. The concentration of absorbents are as follows; 15.3% MEA + 15.3% EG + 69.4% Water, 15.3% MEA + 42.3% EG + 42.3% Water, 15.3% MEA + 15.3% PEG + 69.4% Water, 15.3% MEA + 42.3% EG + 42.4% Water by mass. In each case, the solubility were represented as a function of partial pressure of carbon dioxide.
The solubility of carbon dioxide in the mixed solvent was increased as the partial pressure of carbon dioxide increased. On the contrary, it was decreased as the temperature of the solvent increased.
The effects of the concentration of the mixed solvents showed different aspects with the range of pressures. When the partial pressure of carbon dioxide was very low, the change in the physical solvents made no effect on the carbon dioxide solubility. In the moderate range, the solubility of carbon dioxide decreased. However, when the pressure was very high, it seemed to increase.
The physical property like density and viscosity was measured. These data will be useful to make process design using these solvents.
