Effect of Water Content on Properties of Homogeneous [bmim]Fe(III)Cl4–H2O Mixtures and Their Application in Oxidative Absorption of H2S

Wang, Jianhong; Ding, Renren

doi:10.3390/inorganics6010011

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…However, the author did not mention the time and temperature at which this phenomenon occurred. 55 In this instance, we employed a catalyst loading of up to 20 wt% in water at optimized conditions (room temperature, and time, 4 hours) to cross-check this claim with our observation. Fig.…”

Section: Resultsmentioning

confidence: 64%

Metal-based ionic liquids: effective catalysts in aqueous media for the selective production of vanillin from alkali lignin at room temperature

2022

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Section: Resultsmentioning

confidence: 64%

Metal-based ionic liquids: effective catalysts in aqueous media for the selective production of vanillin from alkali lignin at room temperature

2022

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“…The same group demonstrated that the acidity and Fe(III) concentration of Fe(III)-ILs have significant influence on the oxidation of H 2 S to S 8 and the reduction of [Bmim]Fe(III)Cl 4 to [Bmim]Fe(II)Cl 4 H by varying molar ratios of [Bmim][Cl] and FeCl 3 ·6H 2 O . Meanwhile, in the presence of water, the oxidative-absorption of H 2 S increased, and the emission of volatile HCl decreased with the increase of water content in the range of 5.88–80% . However, high content of water could lead to the decomposition of the organic cations of ILs due to the reaction of water with Fe 2+ and O 2 , and thus only low water content in Fe-based ILs is acceptable.…”

Section: Ils and Dess For Utilization Of H2smentioning

confidence: 99%

“…Cl] and FeCl 3 •6H 2 O 32. Meanwhile, in the presence of water, the oxidative-absorption of H 2 S increased, and the emission of volatile HCl decreased with the increase of water content in the range of 5.88−80% 204. However, high content of water could lead to the decomposition of the organic cations of ILs due to the reaction of water with Fe 2+ and O 2 ,205 and thus only low water content in Fe-based ILs is acceptable.…”

mentioning

confidence: 99%

Rotten Eggs Revaluated: Ionic Liquids and Deep Eutectic Solvents for Removal and Utilization of Hydrogen Sulfide

Laaksonen

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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Hydrogen sulfide (H2S) is highly toxic and one of the problematic impurities in industrial gas streams, calling for H2S removal down to single-digit ppm levels to protect health and environment, and not to harm to the downstream processes. Here, we discuss the recent developments and challenges of current H2S removal technologies. Furthermore, we present a comprehensive review of H2S removal in ionic liquids (ILs), IL-based solvents/adsorbents/membranes, and deep eutectic solvents (DESs) due to their unique advantages. We analyze theoretical studies to better understand the microscopic details behind H2S removal. We discuss new research on IL/DES-based H2S removal processes from an industrial perspective. Finally, we summarize the utilization of H2S in IL/DES-based systems for the recovery of sulfur and hydrogen, and synthesis of value-added chemicals. This review will provide both general and in-depth knowledge of the achievements, difficulties, and research priorities in developing novel ILs/DESs for efficient and sustainable H2S removal and utilization.

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“…Water accumulated in a desulfurization system could increase the solubility in the desulfurizer and limit sulfur precipitation. Wang and Ding 111 reported that adjusting water content from 5.88% to 80% could regulate the acidity of the [Bmim]FeCl 4 system and increase the H 2 S removal efficiency, yet it is difficult to prevent the formation of sulfur blockage at vol % (H 2 O) ≥ 80%. Lee et al 41 stated that high water content in [Bmim]FeCl 4 can react with Fe 2+ and O 2 to produce •OH radicals, leading to the decomposition of Fe-based ILs organic cations.…”

Section: Oxidative Desulfurization Of H 2 S In Milsmentioning

confidence: 99%

Metal-Based Ionic Liquids in Oxidative Desulfurization: A Critical Review

Fen

Qazi

et al. 2021

Environ. Sci. Technol.

121

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Ionic liquids (ILs) as novel functional desulfurization materials have attracted increasing attentions. Metal-based ionic liquids (MILs) are classified into three types of metal chloride ILs, metal oxide ILs, and metal complex ILs based on the definition and basic structure of MILs in this critical review. On the basis of the properties of ILs such as structure designability, super dissolution performance, good thermal and chemical stability, nonflammability, and wide electrochemical window, MILs exhibit unique advantages on hydrophobicity, oxidation performance, and Bronsted−Lewis acidity. Therefore, MILs possess both the absorption and oxidation centers for the intramolecular adsorption and oxidation to improve the oxidative desulfurization (ODS) process. During the novel nonaqueous wet oxidative desulfurization process (Nasil), H 2 S can be oxidized into elemental sulfur with hydrophobic MILs, which can be regenerated by oxygen for recycle, to solve the problems of low sulfur capacity, low sulfur quality, and severe secondary pollution in the aqueous Lo-Cat wet oxidative desulfurization process. Another outstanding feature of MILs in ODS is biomimetic catalysis, which has the function of activating molecular oxygen and improving the oxidation performance. Metal oxide ILs and metal complex ILs are used in combination with hydrogen peroxide or oxygen with the existing water to generate a Fenton-like reaction to convert hydrophobic organic sulfur or SO 2 into hydrophilic sulfoxide/sulfone or sulfur acid, respectively. However, the corrosion of Cl − to the equipment and emulsification phenomenon in the extraction process of sulfoxide/sulfone separation still need further study. Furthermore, the promising strategies to construct highly efficient and green desulfurization processes for large-scale applications are provided.

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Effect of Water Content on Properties of Homogeneous [bmim]Fe(III)Cl4–H2O Mixtures and Their Application in Oxidative Absorption of H2S

Cited by 10 publications

References 31 publications

Metal-based ionic liquids: effective catalysts in aqueous media for the selective production of vanillin from alkali lignin at room temperature

Metal-based ionic liquids: effective catalysts in aqueous media for the selective production of vanillin from alkali lignin at room temperature

Rotten Eggs Revaluated: Ionic Liquids and Deep Eutectic Solvents for Removal and Utilization of Hydrogen Sulfide

Metal-Based Ionic Liquids in Oxidative Desulfurization: A Critical Review

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