Abstract
The solubility of hydrogen sulfide in different mole ratios of ferric chloride and 1-butyl-3-methylimidazolium chloride ionic liquid (rFeCl3/[bmim]Cl, r = 0.6, 0.8, 1.0, 1.2, 1.4) at temperatures of 303.15 to 348.15 K and pressures of 100 to 1000 kPa was determined. The total solubility increased with the increase of pressure and the decrease of temperature. The solubility data were fitted using the reaction equilibrium thermodynamic model (RETM). The mean relative error between the predicted value and the measured value was less than 4%. Henry’s coefficient and the equilibrium constant of chemical reaction at each temperature were calculated. Henry’s coefficient first decreased and then increased with the increase of mole ratio, and increased with the increase of temperature. The equilibrium constant of the chemical reaction followed the same law as Henry’s coefficient. The chemical solubility was related to both Henry’s coefficient and the chemical equilibrium constant. H2S had the highest chemical solubility in FeCl3/[bmim]Cl at a mole ratio of 0.6 and a temperature of 333.15 K. The chemical solubility increased with the increase of pressure.
Highlights
Hydrogen sulfide (H2S) is produced along with industrial production, natural gas development, biogas, and sludge treatment [1,2]
Compared with other desulfurization methods, the advantage of the liquid oxidation catalyst (LO-CAT) method is that the raw material iron is cheap, easy to obtain, and harmless, and the desulfurization process is highly efficient [4]
The by-product salts generated in the LO-CAT method process blocks the pipeline and enters the wastewater, and it requires high energy consumption to treat the wastewater before it can be discharged into the environment
Summary
Hydrogen sulfide (H2S) is produced along with industrial production, natural gas development, biogas, and sludge treatment [1,2]. The liquid oxidation catalyst (LO-CAT) method [3] is a widely used wet oxidation desulfurization technology in which Fe(III) in the absorbent reacts with H2S in the gas to become Fe(II), and H2S becomes elemental sulfur. The LO-CAT method still has some problems [5,6]: (1) Iron complex in the absorbent is easy to decompose, resulting in loss of oxidants. (3) By-product salts, such as thiosulfate and sulfates, are formed due to overoxidation of H2S in an alkaline or neutral solution. The by-product salts generated in the LO-CAT method process blocks the pipeline and enters the wastewater, and it requires high energy consumption to treat the wastewater before it can be discharged into the environment
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