Thermodynamic Modeling the Solubility of CO2 in Aqua System of Methyldiethanolamine and 2-(2-Aminoethylamino)ethanol Using the Nonelectrolyte Wilson Nonrandom Factor

Document Type : Original Article


1 Chemical Engineering Department, Arak Branch, Islamic Azad University, Arak, Iran

2 Department of Basic Sciences, Shahid Sattari Aeronautical University of Science and Technology, Tehran, Iran

3 Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran


Alkanolamines are used to remove acidic gases such as CO2 and H2S from natural gas. In this study, thermodynamic modeling of the binary component CO2+MDEA, three component MDEA+H2O+CO2 and the quaternary MDEA+AEEA+H2O+CO2 systems were developed using an additional Gibbs argillic model for the first time in the modeling of CO2 solubility in different solutions. The appropriate model was considered using the assumption of an entirely molecular system without any occurrence of chemical reactions and saturated gas phase from the CO2 gas. The nonelectrolyte Wilson nonrandom factor (N-Wilson-NRF) model and the activity coefficient method (γ_φ Aproach) were used to calculate solubility of CO2. The two-component water- CO2 model was modeled and the results were obtained by the accuracy of 1.38 of experimental results. In a three-component, water-CO2-MDEA system with the amount of 6.913, the optimization was developed. The quaternary water-CO2-MDEA-AEEA system was optimized with an overall approximation of 19.537 for all experiment data.


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