Gas-Liquid Equilibrium Data for Sulfur Dioxide + Nitrogen in Diethylene Glycol + Water at 298.15 K and 123.15 kPa

摘要

Isothermal gas—liquid equilibrium (GLE) data have been measured for the system diethylene glycol (DEG) (1)4- water (2) + SO2 (3) + N2 (4) at 298.15 K and 123.15 kPa and SO2 partial pressures in the range of (0.7 to 100) Pa. Measurements were carried out by a saturation method using a glass absorption apparatus, which was controlled at constant temperatures by a thermostatic circulation bath with a Beckmann thermometer. The GLE compositions were obtained with relative uncertainties within ± 0.6 % for SO2 concentration in the liquid phase and ± 3.5 % for SO2 mole fraction in the gas phase. The measurement showed that the system DEG (1) + water (2) in the mass fraction range of w1 = (0.60 to 1.00) decreased the solubility of SO2 and the system DEG (1) + water (2) in the mass fraction range of w1 = (0.00 to 0.60) increased the Solubility of SO2. Compared with our previous work (Zhang, J. B.; Wei, X. H.; et al. J. Chem. Eng. Data 2008, 55, 2372-2374; Zhang, J. B.; Wei, X. H.; et al. J. Chem. Eng. Data 2009, DOI: 10.021/ je900392e)i the solubility of SO2 in pure DEG is 259 mg·L~(-1) when SO2 volume fraction in the gas phase is Φ3 = 5·10~(-4), which is higher than in pure ethylene glycol (EG, 128 mg·L~(-1)) and lower than in pure poly(ethylene glycol) 400 (PEG 400,1330 mg·L~(-1)). 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 various PEG aqueous solutions.