Potassium carbonate solution (K2CO3) is a widely used solvent for CO2 removal due to the low toxicity, low tendency of degradation, less energy requirement, high solubility in carbonate / bicarbonate system and other concerns asthe corrosion. For absorption, an aqueous solution of 20-40% K2CO3 is used as close as possible to the saturation without the phenomenon of crystallization [1,2,3]. Since the rate of CO2 absorption is relatively slow in K2CO3, the use of various promoters has been required. In this work, ethylenediamine (EDA) and triethylenetetramine (TETA) were chosen as rate promoter candidates. Prior to the experimental determinations specific to the absorption process, all the physical properties involved must be known: the viscosity and density of the solution, the CO2 diffusion coefficient in the amine solution, as well as the Henry constant for CO2 in the amine solution [2,3]. The densities of the ternary aqueous solutions (K2CO3-Amine-H2O) have been measured for a blending 25 wt % potassium carbonate, amine concentrations between 1 and 10 wt %, at atmospheric pressure and temperatures from 303 K to 343 K (Figure). The densities for each solution have been measured with an Anton Paar digital vibrating glass tube densimeter, DMA 4500 model [3]. The experimental data have been correlated with temperature through a semiempirical equation with three coefficients which depend on the concentration and on the amine type with the equation p = a+bT+cT2 and the constants a, b, c have been identified by regression.