Thermodynamic Modeling the Solubility of CO۲ in Aqua System of Methyldiethanolamine and ۲-(۲-Aminoethylamino)ethanol Using the Nonelectrolyte Wilson Nonrandom Factor

Alkanolamines are used to remove acidic gases such as CO۲ and H۲S from natural gas. In this study, thermodynamic modeling of the binary component CO۲+MDEA, three component MDEA+H۲O+CO۲ and the quaternary MDEA+AEEA+H۲O+CO۲ systems were developed using an additional Gibbs argillic model for the first time in the modeling of CO۲ 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 CO۲ gas. The nonelectrolyte Wilson nonrandom factor (N-Wilson-NRF) model and the activity coefficient method (γ_φ Aproach) were used to calculate solubility of CO۲. The two-component water- CO۲ model was modeled and the results were obtained by the accuracy of ۱.۳۸ of experimental results. In a three-component, water-CO۲-MDEA system with the amount of ۶.۹۱۳, the optimization was developed. The quaternary water-CO۲-MDEA-AEEA system was optimized with an overall approximation of ۱۹.۵۳۷ for all experiment data.

Keywords:

Gas Sweetening , Alkanolamines , Nonelectrolyte Wilson Nonrandom Factor , Thermodynamic Modeling , Solubility