Modeling of CO2 equilibrium solubility in a novel 1‐Diethylamino‐2‐Propanol Solvent

In this work, the equilibrium solubility of CO 2 in a 1‐diethylamino‐2‐propanol (1DEA2P) solution was determined as a function of 1DEA2P concentration (over the range of 1–2 M), temperature (in the range of 298–333 K), and CO 2 partial pressure (in the range of 8–101 kPa). These experimental results were used to fit the present correlation for K 2 (Kent‐Eisenberg model, Austgen model, and Li‐Shen model). It was found that all of the models could represent the CO 2 equilibrium solubility in 1DEA2P solution with ADDs for Kent‐Eisenberg model, Austgen model, and Li‐Shen model of 6.3, 7.3, and 12.2%, respectively. A new K 2 correlation model, the Liu‐Helei model, was also developed to predict the CO 2 equilibrium solubility in 1DEA2P solution with an excellent ADD of 3.4%. In addition, the heat of absorption of CO 2 in 1DEA2P solution estimated by using the Gibbs‐Helmholtz equation was found to be −45.7 ± 3.7 kJ/mol. Information and guidelines about effectively using data for screened solvents is also provided based on the three absorption parameters: CO 2 equilibrium solubility, second order reaction constant (k 2 ), and CO 2 absorption heat. © 2017 American Institute of Chemical Engineers AIChE J , 63: 4465–4475, 2017