Gas-Liquid Equilibrium Data for a Mixture Gas of Sulfur Dioxide plus Nitrogen with Ethylene Glycol Aqueous Solutions at 298.15 K and 123.15 kPa

Isothermal gas-liquid equilibrium (GLE) data have been measured for the system SO(2) + N(2) + ethylene glycol (EG) + water at 298.15 K and 123.15 kPa and SO(2) partial pressures in the range of (0 to 120) Pa. Measurements were carried out by a saturation method using a glass absorption apparatus, which was controlled at constant temperature by a thermostatic circulation bath with a Beckmann thermometer. The GLE data were obtained with relative uncertainties within 3.5 % for SO(2) concentration in the gas phase and 0.6 % for SO(2) concentration :in the liquid phase. The measurement showed that the addition of water to EG enhanced the solubility of SO(2) compared with pure EG and that the 80 % volume fraction of EG in ethylene glycol + water solution is a more reasonable composition used as the desulfurization solution. The results of this work can be used to provide important GLE data for the design and operation of the absorption and desorption process in flue gas desulfurization (FGD) with potential industrial application of EG aqueous solutions.