The principle of desulfurization using complexed iron

2020-05-05View Original

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The principle of desulfurization using complexed iron ions is that H2S is oxidized to elemental sulfur in an alkaline solution by the Fe3+ complexes Fe3+Ln, while Fe3+ itself is reduced to Fe2+Ln by H2S; it is then regenerated by oxidation with air, forming Fe3+Ln again for reuse in this cycle. The reaction is as follows: H2S + 2Fe3+Ln → 2Fe2+Ln + 1/8S8 + 2H+. Another reaction is: 2Fe2+Ln + 1/2O2 + H2O → 2Fe3+Ln + 2HO. The overall reaction is therefore: H2S + 1/2O2 → 1/8S8 + 2H2O. The principle behind the reaction involving complexed iron ions is that, due to the presence of the complexing agent, not only is the solubility of iron ions increased, but their stability is also enhanced.

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The principle of desulfurization using complexed iron

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