Carbon Capture and Storage (CCS) is one of the main options for CO2 mitigation. One option for industrial sites consist in post-combustion capture processes, followed by storage in secured sites. In the various options for industrial CO2 capture, the use of selective absorbents is considered as one of the most adequate methods [1]. The most current absorbents are the aqueous solutions of amine used already beneficially in the decarbonation of natural gases. The optimisation of the process goes through the rational use of energy and the choice of the amine, more capacitive and less energy consuming. The thermodynamic study of CO2 dissolution in such aqueous solutions allows the correlation and the prediction of absorption capacities and energy cost depending on amine structure and temperature, pressure and composition. These studies have to combine experimental measurements [2-4] and modeling developments [5-6]. This work will present the thermodynamic data experimentally accessible in our laboratory and necessary for the development of predictive models and for the optimization of the process. The properties essential for the understanding of CO2 dissolution (loading charge, enthalpy of dissolution, dissociation constants, excess enthalpies...) will be illustrated through some examples.