Abstract
In a previous work, the binary mixture of polyethylene glycol 200 (PEG) and dimethyl sulfoxide (DMSO) was used as a promising medium for absorption of SO2 (J. Chem. Eng. Data2015, 60, 2135). As a continuation of the previous study, the solubility data of dilute SO2 in the binary mixture of PEG+DMSO were measured by isothermal gas-liquid equilibrium experiments at 298.15K and 122.66kPa with SO2 partial pressure below 128Pa in the gas phase. The solubility of SO2 decreased gradually with increasing mass fraction of PEG in the mixtures. We found that the absorption process, which obeyed Henry's law within the given experimental conditions, was physical absorption, and Henry's constants were further calculated from solubility data. Furthermore, to obtain important information about the absorption mechanism, the inter-molecular interactions among SO2, PEG, and DMSO were investigated by UV, FTIR, and 1H NMR spectroscopic techniques. Spectral results showed that the interactions among SO2, PEG, and DMSO were resulted from both intermolecular hydrogen bonding and the O→S charge-transfer interaction.
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