Density of Water (1) + Diethanolamine (2) + CO₂ (3) and Water (1) + <i>N</i>-Methyldiethanolamine (2) + CO₂ (3) from (298.15 to 423.15) K

Abstract

Densities in liquid solutions of water + diethanolamine (DEA) and water + N-methyldiethanolamine (MDEA) have been measured at temperatures from (298.15 to 423.15) K. The mass fraction of amine ranged from 0.3 to 1.0. Excess molar volumes of the binary system were derived and correlated by a fourth order Redlich–Kister equation and a second polynomial function with respect to the temperature. Densities in liquid solutions of water + DEA + CO2 and water + MDEA + CO2 have been measured at temperatures from (298.15 to 423.15) K. The mass fraction of amine in water was 0.3 and 0.4. The CO2 loading ranged from 0.1 to 0.5. Molar volumes of the ternary system were correlated by the equation from Weiland et al. at each temperature. The parameters were in turn fitted by a polynomial function of the temperature.