H2S Absorption Capacity and Regeneration Performance of Amine Fe-based Ionic Liquid†

doi:10.7503/cjcu20130734

Abstract

Abstract:

Amine Fe-based ionic liquid 1.6Et₃NHCl·FeCl₃ was synthesized with ideal H₂S absorption capacity and good thermostability. H₂S removal efficiency was tested under the condition with H₂S concentration of 832 mg/m³, temperature ranging from 40 ℃ to 180 ℃, and gas flow of 100, 300, 400 or 500 mL/min. The results showed that when the gas flow was less than 400 mL/min, H₂S removal efficiency could reach 100%; H₂S removal efficiency increased with the increasing in temperature and tended to approach an asymptotic value. Under the optimal conditions, the sulfur capacity of 1.6Et₃NHCl·FeCl₃ was 6.36 g/L, higher than that of [Bmim]FeCl₄. Comparing the FTIR spectra before and after H₂S absorption, redox reaction between 1.6Et₃NHCl·FeCl₃ and H₂S was confirmed. The interaction between H₂S and 1.6Et₃NHCl·FeCl₃/[Bmim]FeCl₄/H₂O has been studied at the molecular level using density functional theory, and the influence of the substrate on H₂S absorption was illustrated to be responsible for the enhancement of H₂S absorption by aminal group. The product after H₂S absorption was orthorhombic crystal sulfur(α), which is the same as the product from traditional aqueous phase oxidation desulfurization. 1.6Et₃NHCl·FeCl₃ionic liquid can be reused efficiently after quick regeneration by air flow.

Key words: H₂S, Amine Fe-based ionic liquid, Wet oxidation

CLC Number:

O621.25⁺4.1

TrendMD:

MA Yunqian, WANG Rui. H₂S Absorption Capacity and Regeneration Performance of Amine Fe-based Ionic Liquid^†[J]. Chem. J. Chinese Universities, 2014, 35(4): 760.

Figures/Tables 4

References 28

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H₂S Absorption Capacity and Regeneration Performance of Amine Fe-based Ionic Liquid^†

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