Experimental investigation and thermodynamic modeling of CO2 absorption by a chemical solution

The capture of acid gases such as CO2 and H2S is one of the most important processes in the oil, gas, and petrochemical industries. In this study, the absorption of CO2 by AMP solution is investigated experimentally in the presence and absence of ionic liquid choline chloride. For this purpose, a high-pressure gaseous absorption system is designed and fabricated. The amount of CO2 absorption at the temperatures of 278.18, 293.15, and 333.3 K, and CO2 partial pressure range of 1 to 10 bar is measured. The experimental results demonstrate that the CO2 absorption increases by increasing the pressure and decreasing the temperature of the system. In addition, as the mass percentage of choline chloride increases, the rate of CO2 absorption increases and CO2 absorption capacity decreases. Also, CO2 absorption is calculated based on the modified Kent-Eisenberg thermodynamic model using MATLAB software. It is revealed that the experimental results are in very good agreement with those obtained from thermodynamic modeling.