OPEN ACCESS
The absorption of carbon dioxide by alkanolamine aqueous solution is directly related to its thermodynamic properties, thus the important thermodynamic properties of the system such as vapor-liquid equilibria and excess molar enthalpies must be first determined for the selection of new absorbents with high absorption rate and strong absorption capacity. However, these data on alkanolamine aqueous solution are rarely seen in the literature. Therefore, the present study measures the excess molar enthalpies of 1, 2-diethylaminoethanol and water at 298.15 K, 303.15 K and 323.15 K in the whole concentration range, using C-80 microcalorimetry, and vapor-liquid equilibria data of the system under the condition of 30-101 kPa using a vapor-liquid double circulation device, correlates the calculated excess molar enthalpies and vapor-liquid equilibria data using non-random two-fluid NRTL model, and finally provides the model parameters of the equation. The results show that the fitting results of the vapor-liquid equilibria and excess molar enthalpies are in good agreement with the experimental values, which further verifies that the model can be used for the absorption of carbon dioxide by alkanolamine aqueous solution.
alkanolamines, vapor-liquid equilibria, NRTL equations, measurement and correlation
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