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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 7
BKCSDE 31(7)
July 20, 2010 

Effects of Halide Anions to Absorb SO2 in Ionic Liquids
Ki Young Lee, Chang Soo Kim, Honggon Kim, Minserk Cheong, Deb Kumar Mukherjee*, Kwang Deog Jung*
Ionic liquids, SO2 absorption, SO2 solubility, Anionic effect
Ionic liquids with halide anions were prepared and the dependency of halide anions on the SO2 solubility of ILs was investigated. The study shows that the SO2 solubility of ionic liquids lies in the range 1.91 ~ 2.22 SO2/ILs mol ratio. SO2 solubility in ionic liquids with varying halide anions follows the order Br > Cl > I. Theoretical investigation was also conducted at the B3LYP level using the Gaussian 03 program. From the theoretical consideration of the interaction between SO2 and [EMIm]X (where X = Cl, Br, and I), it has been proposed that primary interaction of halide occurs with C2-H of the imidazolium and S of SO2. Experimental results further shows that the absorption and desorption process of SO2 in ILs was reversible by the three cycles of the absorption at 50 oC and desorption at 140 oC. The reversibility of SO2 absorption was confirmed by FT-IR studies.
1937 - 1940
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