Carbon dioxide capture processes are investigated with objectives of reduction of energetic costs or improvement of selectivity (purity of removed CO2). One option for selective CO2 separation from industrial effluents is cycle processes based on absorption in aqueous solution of weak bases following by desorption step where the gas loaded absorbent solution is heated. The presentation will focus on amines solutions. The mechanism of absorption is mainly chemical and the structure of the molecule can influence both selectivity and energy of the absorption.The development of these industrial processes requires a thermodynamic characterization of ternary systems: {CO2-water-amine} (capture process) or {CO2-water-electrolyte}(storage process). The objectives of research studies are to predict properties, such as limits of gas solubility and enthalpy of solution, using thermodynamic models. Due to a lack of enthalpy data, most of the models available in literature are developed to correlate solubility data. They correctly represent vapor liquid equilibrium but can failed to predict enthalpy data [1-2]. Then our laboratory has developed specific calorimetric techniques to measure enthalpy of mixing and determine enthalpy of gas absorption [3]. The technique is also used to determine the enthalpies of different chemical reactions involved in the mechanisms of CO2 dissolution [4]. Combination of experimental and modeling studies for thermodynamic representation of CO2 capture and storage will be presented.