Gas–liquid equilibrium data for mixture gas of carbon dioxide + nitrogen in 1,2-ethanediamine + triethylene glycol aqueous solution

<p>Isothermal gas–liquid equilibrium (GLE) data were measured for the system of 1,2-ethanediamine (EDA) + triethylene glycol (TEG) + H<sub>2</sub>O + carbon dioxide (CO<sub>2</sub>) + N<sub>2</sub> at <i>T</i> = 293.15, 298.15, 303.15 and 308.15 K and <i>p </i>= 121.74, 126.94 and 129.87 kPa with CO<sub>2</sub> 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, CO<sub>2</sub> concentration in the gas phase and CO<sub>2</sub> 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 CO<sub>2</sub> absorption process, thus enhancing the performance of aqueous amine-based CO<sub>2</sub> scrubbing.</p>