Calorimetry in Aqueous Solutions of Demixing Amines for Processes in CO2 Capture

International audienceCarbon Capture and Storage (CCS) is a solid option for CO2 mitigation in the atmosphere. One option is the CO2 capture from industrial effluents followed by storage in secured sites. Capture processes are based on selective absorption/desorption cycles of gas in aqueous solutions of amines[1]. The optimization of the capture processes induced the knowledge of thermodynamic properties for the dissolution of CO2 in aqueous media. The experimental thermodynamic study of CO2 absorption in such aqueous solutions [2-4] will then allow development of correlation or prediction models for absorption capacities and energy cost. [5-6] This work will present the thermodynamic data experimentally accessible in our laboratory. The enthalpies of mixing are obtained using customized mixing cells to be used in BT2.15 and C80 differential calorimeters from SETARAM. This equipment allows determining the excess enthalpies for binary systems amine + water. In the case of dissolution of CO2 in aqueous solutions of demixing amine, calorimetry permits also the determination of liquid-liquid phase separation.The results obtained with such measurements will be illustrated through some examples coming from researches on aqueous solutions of demixing amines