LAUSR

In this work, the propylene glycol monomethyl ether (PGME) + dimethyl sulfoxide (DMSO) system was used in absorption process of SO2, and the gas–liquid equilibrium (GLE) data of SO2 in the PGME + DMSO system were determined at T = 298.15, 303.15, and 308.15 K and p = 123.15 kPa. The experimental data are used to develop SO2 solubility model, which shows a potential application for SO2 removal. After that, Henry’s law constants (HLCs) were calculated by fitting the linear slope of solubility, and thermodynamic parameters were computed on the basis of the correlation of HLCs. The regeneration experimental results showed that 98.5% SO2 can be desorbed at 333.15 K and N2 bubbling in 12 min, and no significant loss of absorption capacity for absorption solvents. Additionally, FTIR, UV–vis, and 1H NMR spectra were recorded to discuss the interaction between SO2 and the binary systems of PGME + DMSO, and the results indicated that intermolecular hydrogen bonding association among PGME, DMSO, and SO2 was formed.