Removal of CO2 from Gas Mixture by Aqueous Blends of Monoethanolamine + Piperazine and Thermodynamic Analysis Using the Improved Kent Eisenberg Model

In this study, a system was designed to determine CO2 solubility in alkanolamine solvents. In what follows, the vapor-liquid equilibrium data of CO2 solubility in the 12 wt% MEA aqueous solution and PZ + MEA mixture with various concentrations (1+12wt%, 2+12wt%, and 3+12wt%), at different partial pressure of CO2 (8.44, 25.33, and 42.22 kPa) and various temperatures (303, 313 and 323 K) at a total pressure of 0.83 atm were tested. Also, the variation of CO2 partial pressure, system temperature, and the effect of adding PZ to MEA solvent were studied. The experimental results showed that by increasing the concentration of PZ and CO2 partial pressure, CO2 loading increases and the temperature rise leads to a decrease in CO2 loading. The values obtained for CO2 loading in these experiments were in the range of 0.005-0.216 (molCO2/molAmine), and the maximum obtained value was for 3wt% of PZ + 12wt% of MEA at 303 K. Finally, the improved Kent-Eisenberg model parameters were fitted by using the MATLAB software and the experimental conditions of this study. Average absolute deviations percentage between the calculated and experimental loading was 24.4%, which indicates that the improved Kent-Eisenberg model is in good agreement with experimental data.

کلیدواژه ها:

CO2 solubility ، MEA aqueous solution ، Piperazine additive ، improved Kent-Eisenberg thermodynamic model