DENSITIES AND SOLUBILITIES OF SOLUTIONS OF CARBON-DIOXIDE IN WATER PLUS MONOETHANOLAMINE PLUS N-METHYLDIETHANOLAMINE

Equilibrium solubilities of carbon dioxide in aqueous mixtures of monoethanolamine (MEA) with N-methyldiethanolamine (MDEA) have been studied experimentally at 40, 60, 80, and 100-degrees-C and at partial pressures of carbon dioxide between 1.0 and 2000 kPa. The systems selected for study are 6 wt % MEA + 24 wt % MDEA and 18 wt % MEA + 12 wt % MDEA aqueous solutions. The equilibrium solubilities of carbon dioxide in aqueous solutions are reported as functions of the partial pressures of carbon dioxide for temperatures of 40-100-degrees-C. The densities of the MEA/MDEA aqueous solutions at atmospheric pressure were also measured at temperatures ranging from 30 to 80-degrees-C. The systems selected for density measurements are pure MEA, pure MDEA, 30 wt % MEA, 24 wt % MEA + 6 wt % MDEA, 18 wt % MEA + 12 wt % MDEA, 12 wt % MEA + 18 wt % MDEA, 6 wt % MEA + 24 wt % MDEA, and 30 wt % MDEA aqueous solutions.