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H2S scrubbing process regenerates reagent, produces sulfur

By Chemical Engineering |

An innovative H2S-scrubbing process employs iron particles to catalyze reactions that convert H2S to elemental sulfur. The new approach improves upon traditional H2S-scrubbing processes that constantly consume reagents (like NaOH and bleach) and generate sulfate-laden wastewater that must be treated. The new process also improves upon more recent approaches that use chelated iron compounds to oxidize sulfur, because the chelates degrade over time and the ligands pose potential health and environmental concerns. Developed by Macrotek Inc. (Markham, Ont.; www.macrotek.com), the Sulfcat process dramatically reduces the amount of consumable reagents and water required, significantly lowers wastewater treatment costs and generates a potentially marketable byproduct (elemental sulfur). Emissions of H2S are removed at levels greater than 99%, and the process can be configured to remove H2S down to less than 1 part per million (ppm) if needed, says Chris Ristevski, development engineer at Macrotek. The Sulfcat process (diagram) works by first absorbing H2S from the gas stream with a specially designed absorber system. The H2S then undergoes a series of reactions that convert the absorbed gas to elemental S and water. The reactions are…
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