Assessment of a redox alkaline/iron-chelate absorption process for the removal of dilute hydrogen sulfide in air emissions

Piché, Simon; Ribeiro, Nicolas; Baçaoui, Abdelaziz; Larachi, Fa’ ́ıçal

doi:10.1016/j.ces.2005.04.065

Cited by 20 publications

(15 citation statements)

References 11 publications

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“…Based on the above considerations, a redox-scrubbing concept for the removal of TRS from the kraft industry is presently under investigation at the laboratory-scale (i.e., Piché et al, 2005a;Larachi, 2006a, 2007;Larachi, 2005, 2007a). The concept is established on the combination of iron (present homogenously and/or heterogeneously) and O 2 as a TRS oxidation system.…”

Section: Trs Abatement Using the Iron Chemistrymentioning

confidence: 99%

“…The resulting Fe(II)-cdta formation curve computed with knowledge of cdta anionic species deprotonation constants (Delgado et al, 1997) is mapped in Figure 7. The iron-cdta oxidizing potential was then evaluated on H 2 S (Piché and Larachi, 2005a,c, 2007. At pH < 5, a noticeable fraction of Fe(II) dissociates with cdta.…”

Section: Alkaline Fe(iii)-chelate Scrubbingmentioning

confidence: 99%

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Advances in Chemical Oxidation of Total Reduced Sulfur from Kraft Mills Atmospheric Effluents

Petre¹,

Piché²,

Normandin³

et al. 2007

International Journal of Chemical Reactor Engineering

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Chemical oxidation techniques in use for the reduction of malodorous total reduced sulfur (TRS) emissions in the kraft mills atmospheric effluents were reviewed with an emphasis on recent industrial improvements in chlorine dioxide (ClO 2 ) oxidation of TRS as well as on laboratory developments of an iron-based chemistry process. The ClO 2 approach was implemented successfully at the industrial scale in two Québec kraft mills. The approach consisted in mixing the non-condensable gases (NCG) containing the TRS with gaseous chlorine dioxide obtained either as a residue from a bleach plant vent stream or through vaporization of fresh solution. Full-scale tests have shown that the amount of chlorine dioxide injected or mixed in the NCG was sufficient to reduce the TRS load below the 10 ppmv-regulated levels in a cost efficient way as compared with incineration. A prospective approach validated in laboratory conditions and using the iron redox chemistry for alkaline oxidative scrubbing of TRS is being investigated at Laval University to reduce the odor pollution and to convert TRS into valuable sulfur. Two configurations were evaluated, one consisting of homogeneous Fe(III) sequestered in trans-1,2-diaminocyclohexanetetraacetic acid (cdta) chelates and another of heterogeneous Fe(III) as Fe/Ce oxides-hydroxides mixtures. The relative performances, advantages and weaknesses of the various chemical oxidation processes were discussed. In addition, the fundamentals of the alkaline oxidative scrubbing of TRS using the iron-based alkaline approach were summarized in terms of the gas-liquid thermodynamic equilibria and of the homogeneous and heterogeneous iron redox reactions.

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Section: Trs Abatement Using the Iron Chemistrymentioning

confidence: 99%

Section: Alkaline Fe(iii)-chelate Scrubbingmentioning

confidence: 99%

Advances in Chemical Oxidation of Total Reduced Sulfur from Kraft Mills Atmospheric Effluents

Petre¹,

Piché²,

Normandin³

et al. 2007

International Journal of Chemical Reactor Engineering

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“…Although, the iron‐based method demonstrated higher efficiencies of the desulfurization and better economic outcomes. However, the absorption and conversion of the sulfur compounds should take place in aqueous solutions because sulfur compounds especially H 2 S is difficult to be absorbed and transferred in the solution with acidic nature …”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on the regeneration of desulfurized 1‐butyl‐3‐methylimidazolium tetrachloroferrate [Bmim][FeCl₄] and 1‐butyl‐3‐methylimidazolium thiocyanate [Bmim][SCN] ionic liquids: A raman spectroscopic study

Ullah

Bustam

Al‐Sehemi

et al. 2019

J Raman Spectroscopy

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The room temperature and task‐specific ionic liquids nowadays have been investigated widely for the removal of sulfur compounds from the natural gas streams. However, the major challenge is the recovery of the desulfurized ionic liquids, which need some significant developments. In this study, two magnetic ionic liquids including the 1‐butyl‐3‐methylimidazolium tetrachloroferrate [Bmim][FeCl4] and 1‐butyl‐3‐methylimidazolium thiocyanate [Bmim][SCN] were investigated for their interaction with the sulfur‐rich compound, that is, dibenzothiophene. The ionic liquids samples were desulfurized and then regenerated with the co‐solvent hexane. The samples were characterized and investigated with the analytical techniques including the Fourier‐transform infrared spectroscopy, ultraviolet–visible absorption analysis, thermogravimetric analysis, and detailed analysis by Raman spectroscopy. The desulfurization results demonstrated that there is no significant influence of the dibenzothiophene molecules on the basic structures of ionic liquids. The regeneration results revealed that the high polarity of the co‐solvent hexane successfully dissolve the dibenzothiophene and efficiently separated from the ionic liquids. Hence, the work present here in this study could be applied for the extractive removal of sulfur compounds from ionic liquids for their regeneration using high polarity co‐solvent hexane.

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“…In this context, Iliuta and Larachi introduced a modelling framework integrating the oxidation of H 2 S and the regeneration of ferrous chelates in a countercurrent randomly packed bed. Also Piché et al studied the absorption of H 2 S in solutions of FeCDTA (CDTA = trans ‐1,2‐ diaminocyclohexanetetraacetate) in a countercurrent laboratory column filled with 15 mm plastic Ralu rings at pH 8.5–10.5 and with H 2 S concentrations of 70–430 ppm. In that study, a 25% increase in removal efficiency compared to pure alkaline solutions was obtained.…”

Section: Introductionmentioning

confidence: 99%

Removal of reduced sulfur compounds from diluted gas streams by iron(III)EDTA in a trickling filter with in situ iron re‐oxidation

Kasper

Feilberg

2019

J of Chemical Tech & Biotech

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BACKGROUND The relatively low solubility of reduced sulfur compounds can limit their removal in trickling filters treating large volumes of air at low residence times. This could be overcome by addition of an oxidizing agent. In this study, the oxidative absorption of reduced sulfur compounds – hydrogen sulfide (H2S), methanethiol (CH3SH) and dimethyl sulfide (CH3S2CH3) – in a high‐porosity trickling filter with added iron chelated by ethylenediaminetetraacetic acid (EDTA) was examined. The process was observed online by proton transfer reaction mass spectrometry (PTR‐MS). RESULTS Removal efficiencies of H2S remained in the range 80–99% for all combinations of operating parameters tested. The removal efficiency of CH3SH was found to be limited compared to this, with removal efficiencies ranging from 10% to 74% and a strong dependence on gas flow rate and residence time was observed; CH3S2CH3 was found to be inactive. The FeEDTA solutions were prepared from ferrous chloride (FeCl2) as solutions of this compound were more stable than solutions prepared from ferric salts. Oxygen present in the gas stream allowed oxidation of Fe2+EDTA to Fe3+EDTA in situ, making regeneration prior to experimental runs unnecessary. To maintain high removal efficiencies during start‐up, pH should be kept above 7. CONCLUSION Chelated iron catalysts could be effectively applied for H2S removal in a one‐step trickling filter process treating low‐concentration (<3.5 ppm) and diluted waste gas streams, which are characteristic for environmental waste treatment facilities and livestock houses. However, removal of other reduced sulfur compounds important for deodorization was found to be limited. © 2019 Society of Chemical Industry

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Assessment of a redox alkaline/iron-chelate absorption process for the removal of dilute hydrogen sulfide in air emissions

Cited by 20 publications

References 11 publications

Advances in Chemical Oxidation of Total Reduced Sulfur from Kraft Mills Atmospheric Effluents

Advances in Chemical Oxidation of Total Reduced Sulfur from Kraft Mills Atmospheric Effluents

Experimental investigations on the regeneration of desulfurized 1‐butyl‐3‐methylimidazolium tetrachloroferrate [Bmim][FeCl₄] and 1‐butyl‐3‐methylimidazolium thiocyanate [Bmim][SCN] ionic liquids: A raman spectroscopic study

Removal of reduced sulfur compounds from diluted gas streams by iron(III)EDTA in a trickling filter with in situ iron re‐oxidation

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Assessment of a redox alkaline/iron-chelate absorption process for the removal of dilute hydrogen sulfide in air emissions

Cited by 20 publications

References 11 publications

Advances in Chemical Oxidation of Total Reduced Sulfur from Kraft Mills Atmospheric Effluents

Advances in Chemical Oxidation of Total Reduced Sulfur from Kraft Mills Atmospheric Effluents

Experimental investigations on the regeneration of desulfurized 1‐butyl‐3‐methylimidazolium tetrachloroferrate [Bmim][FeCl4] and 1‐butyl‐3‐methylimidazolium thiocyanate [Bmim][SCN] ionic liquids: A raman spectroscopic study

Removal of reduced sulfur compounds from diluted gas streams by iron(III)EDTA in a trickling filter with in situ iron re‐oxidation

Contact Info

Product

Resources

About

Experimental investigations on the regeneration of desulfurized 1‐butyl‐3‐methylimidazolium tetrachloroferrate [Bmim][FeCl₄] and 1‐butyl‐3‐methylimidazolium thiocyanate [Bmim][SCN] ionic liquids: A raman spectroscopic study