Measurement of carbon dioxide solubility in aqueous mixture of N-methyldiethanolamine + Aminoethylethanolamine + sulfolane at different temperatures
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1Chemical Engineering, Tarbiat Modares University, Tehran, Iran
2Department of Chemical Engineering, Tarbiat Modares University,Tehran, Iran
Removal of acid gases such as CO2 and H2S from natural gas and CO2 capturing are among the major steps in the gas industry that also affect the environment. Over decades, alkanolamines have been widely used for gas sweetening processes; however, along with the chemical solvent, a physical solvent has often been used to intensify the kinetics absorption of carbon dioxide. In this work, we obtained new experimental vapor-liquid equilibrium data for CO2 solubility in MDEA + AEEA + sulfolane + water with the compositions of (20-10-20-50 wt.%) and (20-10-10-60 wt.%) respectively, within the temperature of 313.15 and 343.15 K and the CO2 partial pressures of 100-5300 kPa. The results show that for both compositions, by increasing temperature the loading of CO2 was reduced at a fixed partial pressure of CO2. Moreover, the present findings showed that CO2 solubility was enhanced by increasing sulfolane concentration. However, at low acid gas loading, the CO2 loading was reduced by enhancing the sulfolane concentration.