Removal of acid gases is an important step of natural gases and industrial gas streams processing. Aqueous solutions of alkanolamines are well known to be efficient chemical solvents for the CO2 capture. Reliable experimental thermodynamic data are needed to design safe and efficient gas treating equipments. Moreover, the lack of experimental data reduce the possibility to develop efficient models to describe this process. The aim of this work is to obtain the solubilities and the enthalpies of solution of acid gases in aqueous solutions of alkanolamines at two different temperatures (323 and 373 K) and at pressures up to 5 MPa as well as the dissociation constants of those amines at atmospheric pressure and as a function of temperature. The amines chosen are MonoEthanol Amine (MEA), DiEthanol Amine (DEA), TriEthanol Amine (TEA), MethylDiEthanol Amine (MDEA), and 2-Amino-2-Methyl propanol (AMP). All the amines are studied at two concentrations, namely 15 and 30 wt%. Those amines are classically considered in industrial processes. Moreover these solutes are representatives of primary, secondary and tertiary amines that differ in their reactivity with CO2 in aqueous solutions. Customized flow mixing unit adapted to the SETARAM C-80 calorimeter [1] is used to measure the enthalpy of solution of CO2 with aqueous solutions of alkanolamines . The experiments are carried out at constant temperature and pressure for different gas loadings up to the saturation of the solvent. The gas solubility data are deduced from the analysis of the enthalpic data. A potentiometric method using an automatic titrator from Mettler-Toledo equipped with a glass electrode was used to determine the dissociation constants of the amines on the temperature range between 298 K and 333 K. The influence of the structure and the concentration of the amine on the thermodynamic properties will be discussed simultaneously to the intensive parameters, namely the temperature and the pressure. Those data will allow to develop rigorous thermodynamic models, that will be described elsewere in this conference [2].