Research On Flue Desulfurization Performance By Binary Composite Ionic Liquid

Sulphur dioxide is the main pollutant,which causes global air pollutionproblems-acid. So, both terminal management and process control arenecessary to purify air to achieve standards. Among FGD, wet desulfurizationhas been used widely in industry. Transition metal ions for liquid catalyzedoxidation have attracted extensive attention due to high efficiency and fast rateof desulfurization. Aiming at the problem of separation and recovery of liquidcatalytic oxidation product, our research group has been exploring a new wetflue gas desulfurization process, Fe-based ionic liquid-water-ethanolhomogeneous desulfurizat-ion system. The result shows that the newhomogeneous wet flue gas desulfurization process presents high removalefficiency. But the desulfurization system products a less of sulfuric acid, andthis study hasn't not involved in binary metal-based ionic liquids ondesulfurization research. Therefore, some ionic liquid composites based onbinary transition mental ions mixtures are proposed to homogeneousdesulfurization system in this work.The Fe(III)-Mn(II) and Fe(III)-Cu(I) binary composite ionic liquid weresynthesized by1-butyl-3-methyl chloro-imidazo ([Bmim]Cl),FeCl₃·6H₂O,MnCl₂and CuCl. The structure of the composited ionic liquid was detected byUV spectra, FT-IR and FT-Raman spectra. The results show that the basicstructure of Fe(III)-Mn(II) binary system ionic liquids doesn't change, and thesecond metal can increase the total metal content in the composite ionic liquid. Desulfurization experiments showed that Fe(III)-Mn(II) binary complex ionicliquids could promote the removal of sulfur dioxide by synergistic effect.Fe(III)-Cu(I) binary composite ionic liquid can promote the rate ofdesulfurization in certain conditions. The content of sulfuric acid produced byFe(III)-Mn(II) composited ionic liquid desulfurization is up to54.1%, the oneby Fe(III)-Cu(I) binary binary composited ionic liquid is30%.Therefore, the binary system of Fe(III)-Mn(II) ionic liquid can be usedfor removal of sulfur dioxide, not only inherited the advantages ofFe-IL-water-ethanol homogeneous desulfurization system, which solve theproblems of difficult separation of the product and losing catalyst; but alsoincreased the content of sulfuric acid; It provide a theoretical basis forintegratied desulfurization for desulfurization, regeneration and separation.