Absorption capacity and time optimization of CO2 capture in MEA–EG system based on kinetic-thermodynamic coupled model

To address the high energy consumption, insufficient thermal stability, and lack of systematic optimization strategies of conventional aqueous alkanolamine CO 2 absorbents, this study developed a blended monoethanolamine/ethylene glycol (EG) absorbent system by replacing water with EG. The CO 2 absorption performance was systematically investigated. Validated kinetic and thermodynamic models were integrated into a robust coupled model to simulate absorption behavior. Based on the coupled model, two optimization strategies for the CO 2 absorption process were proposed: determining the optimal absorption temperature to maximize absorption capacity under fixed CO 2 partial pressure and absorption time; identifying the optimal temperature to minimize absorption time under fixed CO 2 partial pressure and absorption capacity. The research results indicate that both optimization strategies exhibit significant optimization effects under a variety of absorption conditions. This study provides a vital theoretical framework and experimental foundation for the design of industrial CO 2 capture absorbents and the optimization of process parameters.