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A catalyst-free process for gas ozonation of reduced sulfur compounds

Abstract : The feasibility of homogenous gas ozonation process was investigated in order to reduce the negative environmental impact caused by reduced sulfur compounds (RSCs). Emitted from a variety of industrial plants, this class of compounds are known by their odor properties. Selecting hydrogen sulfide (H2S), methyl ethyl sulfide (MES) and dimethyl disulfide (DMDS) as representative odorous RSCs, the influence of four gas ozonation process parameters (ozone concentration, humidity level, reactor temperature and residence time) on their removal efficiencies was evaluated using a Doehlert experimental design in an experimental domain compatible with industrial constraints. Ozone concentration was the only process parameter that has resulted in a positive – but limited – effect on the removal efficiency of the mix of RSCs. However, even if ozone was present in large excess (20 times the RSCs concentration), MES and DMDS were slightly consumed (around 30%). Only H2S has shown interesting removal efficiencies (up to 80%). In addition to the measurement of reagent concentrations, Selected Ion Flow Tube coupled with Mass Spectrometry (SIFT/MS) was applied to identify and quantify the potential products of RSCs-ozone reaction. Methyl ethyl sulfone (MESO2) was found to be the primary product of MES, whereas methyl methanethiosulfinate (DMSOS) and sulfur dioxide (SO2) for DMDS, suggesting that the organic monosulfide and disulfides would not follow the same reaction mechanism with ozone in gas phase. In addition, SO2 and H2O may not be the only end products for H2S ozonation, since additional peaks were detected in SIFT/MS spectra
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Submitted on : Monday, November 30, 2020 - 11:45:31 AM
Last modification on : Thursday, May 13, 2021 - 3:01:33 AM

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Leticia Vitola Pasetto, Valérie Simon, Romain Richard, Jean-Stéphane Pic, Frédéric Violleau, et al.. A catalyst-free process for gas ozonation of reduced sulfur compounds. Chemical Engineering Journal, Elsevier, 2020, 387, ⟨10.1016/j.cej.2019.123416⟩. ⟨hal-02573074⟩



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