Densities of unloaded and CO₂-loaded 3-dimethylamino-1-propanol at temperatures (293.15 to 343.15) K

Highlights: • Densities of 3-dimethylamino-1-propanol solutions were measured at different mass fractions and temperatures up to 343.15 K. • Excess molar volumes for unloaded solutions were correlated using Redlich–Kister method. • Experimental density data for CO₂-loaded solutions were correlated using Weiland method. - Abstract: This article reports experimental density values of aqueous 3-dimethylamino-1-propanol (3DMA1P) solutions over the entire range of 3DMA1P mass fractions and temperatures of (293.15 to 343.15) K. Based on the experimental results, corresponding values of thermal expansion and excess molar volume of 3DMA1P solutions were established. A second order Redlich–Kister polynomial equation satisfactorily correlates excess molar volumes against mole fractions of 3DMA1P solutions, and regression of these parameters as a function of temperature is demonstrated. Densities of carbonated 3DMA1P solutions were also measured at three 3DMA1P mass fractions of 0.20, 0.30 and 0.50, at different CO₂-loadings up to 0.8 mol CO₂/mol 3DMA1P, and temperatures. These data were modeled. A comparison between experimental and calculated values are discussed.