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Hg⁰ removal from flue gas by ionic liquid/H₂O₂
Guangwen Cheng1, Bofeng Bai2, Qiang Zhang3
1National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Limited Company, Xi'an 710032, China; Xi'an Jiaotong University, Xi'an 710049, China.
Abstract:
1-Alkyl-3-methylimidazolium chloride ionic liquids ([Cnmim] Cl, n=4, 6, 8) were prepared. The ionic liquid was then mixed with hydrogen peroxide (H2O2) to form an absorbent. The Hg(0) removal performance of the absorbent was investigated in a gas/liquid scrubber using simulated flue gas. It was found that the ionic liquid/H2O2 mixture was an excellent absorbent and could be used to remove Hg(0) from flue gas. When the mass ratio of H2O2 to ionic liquid was 0.5, the absorbent showed high Hg(0) removal efficiency (up to 98%). The Hg(0) removal efficiency usually increased with the absorption temperature, while decreased with the increase of alkyl chain length in ionic liquid molecule. The Hg(0) removal mechanism involved with Hg(0) oxidation by H2O2 and Hg(2+) transfer from aqueous phase to ionic liquid phase.
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