Metal 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.

中文翻译：

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螯合物在液体氧化还原脱硫过程中的降解研究

在湿式氧化脱硫过程中用作假催化剂或氧载体的金属络合物，例如 Fe-EDTA，会受到降解机制的影响，这会显着影响此类过程的经济性。因此，本研究提出了一种方法，用于确定在连续运行的半间歇反应器系统内的 Fe-EDTA 溶液中反应性硫化氢吸收过程中的降解程度。为此，液相中 H2S 的反应转化率被用作参考，可以显示降解对 pH 值的明显依赖性。此外，还引入了指标来评估观察到的降解的 pH 依赖性并区分 pH 诱导的影响，例如 H2S 的 pH 依赖性吸收性能。