科研之友
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摘要
In a previous work, the binary mixture of ethylene glycol (EG) (1) + N,N-dimethylformamide (DMF) (2) was used as a promising medium for the absorption processes of SO2 (J. Chem. Thermodyn. 2013, 62, 8-16). In this work, the desorption property and spectral changes of dilute SO2 in an ethylene glycol (EG) + N,N-dimethylformamide (DMF) binary system were studied to determine the possible intermolecular interaction of SO2 with DMF and DMF + EG. Desorption data showed that SO2 could desorb from the dissolving SO2 mixture, the 98% SO2 could be removed from the dissolving SO2 mixture, and the regenerate solution showed a similar SO2 absorption capacity with fresh solution. For determining the important interaction mechanism, conventional UV, Fourier transform infrared (FTIR), and H-1 NMR spectroscopic techniques were used in absorption processes of SO2. Spectral results suggested that EG could interact with DMF by hydrogen bonds in the binary mixture by the -CH2CH2-OH center dot center dot center dot O=CH- bond; furthermore, SO2 could interact with DMF in various binary mixtures by the -HC=O center dot center dot center dot(O)SO bond.
