Font Size: a A A

Novel Fe-Based Ionic Liquids Mixed Solutions For The Catalytic Oxidation Of Hydrogen Sulfide To Sulfur

Posted on:2016-08-29Degree:MasterType:Thesis
Country:ChinaCandidate:C HuFull Text:PDF
GTID:2271330473462764Subject:Chemical Engineering and Technology
Abstract/Summary:PDF Full Text Request
The hydrogen sulfide is one kind of virulent noxious gas which is bad for the human body and environment. So the desulfurization technology has become very important. The iron-based liquid is identified as a novel desulfurization sorbent which has made some progress. But it has the poor gas-liquid mass transfer and a little active Fe3+ that can lead to the desulfurizing solution inactivation, small sulfur capacity and slow solution-regeneration rate during the desulflurizing process. So the 1,3-Dimethyl-2-imidazolidinone (DMI) is added to improve gas-liquid mass transfer. The Zn-based ionic liquids (Zn-IL) or Mn-based ionic liquids (Mn-IL) are added to improve the sulphur removal efficiency.Firstly, the Fe-Zn and Fe-Mn binary metallic ionic liquid are synthesize by FeCl3·9H2O, ZnCl2, MnCl2 and [Bmim]Cl. Experimental results show that composite metal ionic liquids have the better sulphur removal efficiency. The efficiency of desulfurization is increasing with the mass addition of Zn-IL or Mn-IL. Subsequently, the Fe-IL/DMI has the better sulphur removal efficiency than composite metal ionic liquids.As the quality of the DMI accounts for 15% of the Fe-IL, the desulfurization efficiency is the best. Then, the Fe-Zn-IL/DMI and Fe-Mn-IL/DMI are synthesize by Fe-IL, Zn-IL, Mn-IL and DMI. Thereinto, the quality of the DMI accounts for 15% of the Fe-IL. As the mass addition of Zn-IL or Mn-IL increases, sulphur removal efficiency is increasing first and then decreasing gradually. When the Mn-IL accounts for 20% quality of Fe-IL, the Fe-Mn-IL/DMI achieves the optimal performance. When the Zn-IL accounts for 10% quality of Fe-IL, the Fe-Zn-IL/DMI can get better results.Based on the Fe-Zn-IL/DMI, the respective impact of different rates of flow, temperatures, water vapor, and the concentration of H2S are investigated. The results show that the absorption efficiency of H2S can keep above 99% in 600 min with room temperature (20~30℃), no water vapor, low rate of flow (40 mL·min-1) and H2S concentration 8000 ppm. And the absorption solution can be reused through regeneration when sulphur capacity attains saturation. The absorption efficiency of H2S can achieve above 90% in 240 min.Then the fresh liquids and the absorption solutions are analyzed by infrared spectrum, raman spectrum and thermogravimetric analysis. And the precipitations are analyzed by X-ray diffraction and optical microscope. They can figure out how the Zn-IL or DMI works during the desulfurization. And this process has many advantages such as simple operation, mild reaction conditions and low energy consumption. It is in prospect of scale-up experiments and industrialization.
Keywords/Search Tags:Fe-based ionic liquids, Zn-based ionic liquids, Mn-based ionic liquids, 1,3-Dimethyl-2-imidazolidinone, desulfurization
PDF Full Text Request
Related items