Abstract
Solubilities of SO2 in binary mixtures of urea and ethylene glycol were determined by gas–liquid equilibrium experiments at the temperatures from (298.15 to 318.15 K) and 122.7 kPa, with SO2 partial pressure in gas phase in the range of (0 to 130) Pa. Henry’s law constants were calculated based on the solubility data. It indicated that the mixture with urea molality of 6.65 mol·kg–1 has the most desirable capacity. More than 90 % SO2 can be regenerated by bubbling N2 at 338.15 K. Density and viscosity data for the binary mixtures were also measured. In addition, UV, IR, and NMR experiments were conducted to investigate the interaction between ethylene glycol, urea, and SO2. The result demonstrated that SO2 can interact with the mixture by both the charge-transfer interaction between S (SO2)···N (urea) and the hydrogen bond between O (SO2)···H (ethylene glycol).
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