Gas–liquid equilibrium data for mixture gas of carbon dioxide + nitrogen in 1,2-ethanediamine + triethylene glycol aqueous solution
Isothermal gas–liquid equilibrium (GLE) data were measured for the system of 1,2-ethanediamine (EDA) + triethylene glycol (TEG) + H2O + carbon dioxide (CO2) + N2 at T = 293.15, 298.15, 303.15 and 308.15 K and p = 121.74, 126.94 and 129.87 kPa with CO2 partial pressure ranging from 0 to 13.0 kPa. Measurements were carried out using a saturation method in a glass absorption apparatus, which was controlled at the constant temperature by a thermostatic circulation bath with a Beckmann thermometer. The measurement uncertainties for temperature, total pressure, CO2 concentration in the gas phase and CO2 concentration in the liquid phase were less than ±0.02 K, ±0.15 kPa, ±2.5% and ±0.6, respectively. The results indicate that the addition of TEG into the aqueous EDA solution could significantly improve the stability of EDA in CO2 absorption process, thus enhancing the performance of aqueous amine-based CO2 scrubbing.