Abstract
AbstractMetal complexes such as Fe‐EDTA, which are used as pseudo‐catalysts or oxygen carriers in wet oxidative desulfurization processes, are subject to a degradation mechanism that significantly influences the economics of such processes. Therefore, this study presents a methodology for determining the degree of degradation during the reactive hydrogen sulfide absorption in a Fe‐EDTA solution within a continuously operating semi‐batch reactor system. For this purpose, the reactive conversion of H2S in the liquid phase was used as a reference, and a clear dependence of the degradation on the pH could be shown. In addition, indicators are introduced that evaluate the observed pH dependency of the degradation and distinguish pH‐induced effects such as the pH‐dependent absorption performance of H2S.
Highlights
Wet oxidative desulfurization processes have been used since the beginning of the 20th century for the removal of H2S from various process gases
The processes operate on the principle of absorption and oxidation of hydrogen sulfide to elemental sulfur by using an iron chelate or a quinone compound as pseudo-catalyst that can be regenerated with air [1]
The evaluation includes the methodological approach to evaluate the degradation of the chelate complex Fe-Ethylenedinitrilotetraacetic acid (EDTA)
Summary
Wet oxidative desulfurization processes have been used since the beginning of the 20th century for the removal of H2S from various process gases. The processes operate on the principle of absorption and oxidation of hydrogen sulfide to elemental sulfur by using an iron chelate or a quinone compound as pseudo-catalyst that can be regenerated with air [1]. Wet oxidative processes replace so-called dry oxidative processes such as the iron oxide process, since they are comparatively inefficient and characterized by high operating costs, high space requirements, and by poor quality of the recovered sulfur. Compared with so-called neutralization processes, which operate on the principle of absorption and desorption, wet oxidative processes have the advantage that they can selectively separate H2S and form sulfur directly due to the reaction mechanism with an iron chelate complex, as shown in Eqs. The sulfur is separated, and the reduced pseudo-catalyst is regenerated with air in the oxidizer or so-called regenerator
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