Behaviors of SO2 absorption in [BMIm][OAc] as an absorbent to recover SO2 in thermochemical processes to produce hydrogen
- Behaviors of SO2 absorption in [BMIm][OAc] as an absorbent to recover SO2 in thermochemical processes to produce hydrogen
- 이기용; 김훈식; 김창수; 정광덕
- Hydrogen; Ionic Liquid; VHTR; Thermochemical water splitting cycle; Sulfur dioxide absorbent; Sulfur dioxide separation
- Issue Date
- International journal of hydrogen energy
- VOL 35, NO 19, 10173-10178
- The solubility behavior of SO2 in 1-butyl-3-methylimidazolium acetate ([BMIm][OAc]) was
investigated. The solubility of SO2 in [BMIm][OAc] was measured to be 0.6 in mole fraction
at 50 C in a stream of SO2 gas. The desorption of SO2 from [BMIm][OAc] was never
completed, until the temperature was raised to 170 C in a stream of N2, indicating that the
absorption of SO2 is irreversible at the experimental condition. An in-situ IR study showed
that acetate anion in [BMIm][OAc] transformed into acetic acid during the SO2 absorption.
After removing acetic acid at 170 C by evacuation, the bands at 1210, 1045 and 850 cm 1
appeared in IR spectra. The bands at 1210 and 1047 cm 1 were assigned to SeO stretching
mode of HOSO2
(an isomer of HSO3
) and the band at 885 cm 1 was assigned to the
symmetric stretching mode of HOeS. FT-IR study suggested that acetic acid and most
plausibly [BMIm][HOSO2] were generated from the interactions of [BMIm][OAc] with SO2
and adventitious water in feed gas and/or [BMIm][OAc] during absorptionedesorption
process. [BMIm][HOSO2] recovered after removing acetic acid was found to be a new and
reversible SO2 absorbent with the SO2 absorption capacity of 0.55 in mole fraction.
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