Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

ABSTRACT

Experimental solubilities of carbon dioxide in aqueous alkanolamine solutions are reported for the high gas loading region. The experimental phase equilibrium study has been performed for five representative types of alkanolamines namely, monoethanolamine, diethanolamine, methyldiethanolamine, 2-amino-2-methyl-1- propanol and piperazine. Carbon dioxide loadings are determined for a wide range of pressure (62.5-4150 kPa), temperature (303.15-343.15K) and alkanolamine concentration (2-4 molar). The reported values supplement the previously reported values with good conformity. Furthermore, a hybrid form of Kent- Eisenberg model has been developed by incorporating equation of state/excess Gibbs energy model, to correlate the experimental data points. The proposed model is well applicable in high pressure-high gas loading region, by utilizing a single correction parameter. The model predictions are in excellent agreement with the reported data values in this study. Moreover, the model extends satisfactorily to the previously reported values in the literature.