Equilibrium solubility of carbon dioxide in a 30 wt.% aqueous solution of 2-((2-aminoethyl)amino)ethanol at pressures between atmospheric and 4400 kPa: An experimental and modelling study

New experimental equilibrium data were obtained for the solubility of carbon dioxide in an aqueous solution with 30 wt.% of 2-((2-aminoethyl)amino)ethanol (AEEA) at temperatures ranging from (313.2 to 368.2) K and CO2 partial pressures ranging from above atmospheric to 4400 kPa. A thermodynamic model based on the Deshmukh–Mather method was applied to correlate and predict the CO2 solubility in aqueous AEEA solutions. The binary interaction parameters and equilibrium constants for the proposed reactions were determined by data regression. Using the adjusted parameters, equilibrium partial pressures of CO2 were calculated and compared with the corresponding experimental values at the selected temperatures and pressures. Values of carbon dioxide solubility at other temperatures reported in the literature were also calculated. The average absolute deviation for all of the data points was found to be 8.2%. The enthalpy change of the absorption of CO2 in the 30 wt.% aqueous solution of AEEA was also estimated with our model.

CO2 loading (αCO2)(αCO2) as a function of CO2 partial pressure at T = 368.2 K, (♦: data of Ma’mun et al. [2]; □: experimental data of this work; and the solid line represents prediction of the model).Figure optionsDownload as PowerPoint slideHighlights
► New solubility data for CO2 in 30 wt.% aqueous solutions of AEEA is obtained.
► Range of temperature and partial pressure of CO2 are (313.15 to 368.15) K and atmospheric to 4400 kPa.
► Deshmukh–Mather model is applied to the data produced in this work and in literature.
► Binary interaction parameters and reaction equilibrium constants are adjusted.
► The average absolute percent relative deviation for all the data points was found to be 8.2%.