Abstract
Ionic liquids and heteropoly compounds have been found to be effective systems for H2S removal due to their unique properties. This study, which investigated the absorption kinetics of these new systems, continues our earlier research. Specifically, the macro kinetic characteristics of the H2S absorption for three systems, viz., a [Bmim]3PMo12O40/BmimCl solution, an aqueous solution of peroxo phosphomolybdic acid and an aqueous solution of CuH2PMo11VO40, were determined using a gas-liquid reaction cell. The gas and liquid phase mass transfer coefficients were measured, and the activation energy was calculated. The H2S absorption for the [Bmim]3PMo12O40/BmimCl solution can be expressed as a macro kinetic equation: NH2S = 6.6 × 10–2∙[exp(–1064/T)]∙CH2S1.120∙C[Bmim]3PMo12O400.099. For the aqueous solutions of peroxo phosphomolybdic acid and CuH2PMo11VO40, the absorption can be expressed as NH2S = 2.68 × 10–6∙[exp(–790/T)]∙CH2S0.252∙CPHPMo0.131 and NH2S = 1.02 × 10–6∙[exp(607/T)]∙CH2S0.510∙CCuH2PMo11VO400.431, respectively.
Highlights
As a common toxic, corrosive gas existing in natural gas, refined gas, biogas and other industrial gases, hydrogen sulfide (H2S) has threatened the environmental protection and human health seriously (Kashfi and Olson, 2013; Wiheeb et al, 2013; Gupta et al, 2016)
In our previous work (Liu et al, 2017; Ma et al, 2017), the removal of H2S using [Bmim]3PMo12O40/butyl3-methylimidazolium chloride (BmimCl) solution has been proved to be achieved by the [Bmim]3PMo12O40, and the BmimCl only played a role of solvent and reaction medium
For the [Bmim]3PMo12O40/BmimCl solution, the orders of the reactions to [Bmim]3PMo12O40 and H2S were 0.099 and 1.120, respectively, and the activation energy of the overall reaction was identified as 8.84 KJ mol–1; these macro kinetics can be expressed with the equation NH2S = 6.6 × 10–2∙[exp(–1064/T)]∙CH2S1.120∙C[Bmim]3PMo12O400.099
Summary
Corrosive gas existing in natural gas, refined gas, biogas and other industrial gases, hydrogen sulfide (H2S) has threatened the environmental protection and human health seriously (Kashfi and Olson, 2013; Wiheeb et al, 2013; Gupta et al, 2016). A large number of works has been focused on the removal of H2S, and various desulfurization methods have been developed (Lu et al, 2006; Ko and Hsueh, 2012; Wiheeb et al, 2013). Among these methods, the wet methods which use solutions as desulfurizers play an important position in the field of H2S removal due to their high sulfur load bearing and high desulfurization efficiency (Wang, 2003; Dubois and Thomas, 2010).
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