Solubilities of Dilute SO2 in the Binary System of Glycol and Dimethylsulfoxide

Abstract

The solubility of SO2 in binary mixtures of ethylene glycol (EG) and dimethylsulfoxide (DMSO), a potential candidate for use as the scrubbing liquid for the absorption of SO2 from flue gas, are lacking in the literature. The paper presents solubility data of dilute SO2 in these inexpensive solvent mixtures at T = (303.15, 308.15, and 313.15) K and p = 122.66 kPa. The solubilities of dilute SO2 in the mixtures increases gradually with increasing concentration of DMSO and decreasing temperature. The solubility of SO2 is linearly proportional to the experimental pressure. Meanwhile, the Henry’s law constants (H x ), dissolution enthalpy changes, dissolution entropy changes, and dissolution Gibbs energy changes were also obtained from the solubility data of SO2 in the mixtures. The experimental results demonstrate that the binary system of EG and DMSO is a promising alternative in SO2 separation processes due to its excellent absorption and regeneration performance.