Thermodynamics and Stoichiometry of Reactions between Hydrogen Sulfide and Concentrated Sulfuric Acid

Authors

  • Hui Wang,

    1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
    Current affiliation:
    1. Departmetn of Chemical Engineering, University of Saskatchewan, Saskatoon, SK S7N 5C5, Canada
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  • Ivo G. Dalla,

    1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
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  • Lana Chuang,

    1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
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  • Karl T. Chuang

    Corresponding author
    1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
    • Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
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Abstract

A thermodynamic analysis of the possible reactions between hydrogen sulfide and concentrated sulfuric acid shows that four reactions are feasible. However, only two of these reactions apparently occur in experiments at 1 atm and 0°C to 150°C. Hydrogen sulfide is first oxidized by molecular sulfuric acid, forming SO2, sulfur and water, and then the H2S may react with the dissolved product, SO2, to generate sulfur and water. The stoichiometry of the consecutive reactions and their dependence on acid concentration were determined experimentally using mass balance measurements. The results of this study suggest a possible alternative method for sulfur removal and recovery that has more advantages.

Abstract

Une analyse thermodynamique des réactions possibles entre l'hydrogène sulfuré et l'acide sulfurique concentré montre que quatre réactions sont réalisables. Cependant, seulement deux de ces réactions surviennent apparemment dans les expériences à 1 atm et 0°C-150°C. L'hydrogène sulfuré est le premier oxydé par l'acide sulfurique moléculaire, formant du SO2, du soufre et de l'eau, et ainsi le H2S peut réagir avec le produit dissous, le SO2, pour produire du soufre et de l'eau. La stoechiométrie des réactions consécutives et leur dépendance sur la concentration acide ont été déterminées expérimentalement par des mesures de bilan de matière. Les résultats de cette étude suggèrent une méthode alternative possible pour le retrait et la récupération du soufre qui réunit plus d'avantages.

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