In the petroleum and natural gas industry,the removal of carbon dioxide,hydrogen sulfide,or other acid constituents from process gas stream is commonly achieved by reaction these impurities with aqueous alkanolamines [1].Knowledge of physical properties of aqueous blended absorbents mixtures is useful in connection with industrial treatment of acidic gases.Volumetric data in combination with molecular theories of solutions can be used to extend our understanding of molecular interactions occurring in these systems.Derived volumetric properties can be used to deduce a more detailed picture of solute-solvent interactions.Densities of pure 2-(butylamino)ethanol (BAE) and 1-isopropylamino-propan-2-ol (IPAP) were measured.Further,densities of binary mixtures of BAE + water,IPAP + water and ternary mixtures of BAE + IPAP + water were measured over the full range of composition at 303.15,313,15 and 323.15K.Fig.1 shows measured densities of water + BAE mixture.Measured data were correlated with Peng-Robinson equation of state [2].Usually,pure parameters of cubic equation of states were calculated by generalized method from critical temperature,critical pressure and acentric factor.Although densities of vapor predicted from cubic equation of state are reliable,densities of liquid obtained from cubic equation of state based on pure critical data is not suitable for the utilization as basic process design data.Pure parameters of Peng-Robinson equation of state were obtained from measured density of pure substances.Wong-Sandler mixing rule [3] was employed for the correlation of binary and ternary mi