Equilibrium Solubility of Carbon Dioxide in an Aqueous Mixture of N-Methyldiethanolamine and Diisopropanolamine: An Experimental and Modeling Study

In the present work, the equilibrium solubility of carbon dioxide was measured for three different aqueous mixture of N-methyldiethanolamine (MDEA) and diisopropanolamine (DIPA). The sum of the mass fraction of MDEA and DIPA for each aqueous mixture was constant at 100 w = 50. The mass fraction of DIPA was chosen as 100 w = (1, 3, and 5) for the mixture, respectively. The experimental data were measured for the temperature range of (313.2 to 358.2) K and the equilibrium CO2 partial pressure of (85 to 3984) kPa. To predict and correlate the equilibrium solubility behavior of carbon dioxide with an aqueous mixture of MDEA and DIPA, the Deshmukh-Mather model was used. The binary interaction parameters of the model were tuned by regression of experimental data. Having used the tuned parameters, the equilibrium behavior of CO2 with relevant aqueous solution was estimated and compared with the equivalent experimental values. The average absolute deviation (AAD %) was obtained to be 13.2 % for all data points.