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H2S oxidation system for refinery desulfurization

The European Union has recently promulgated new directives reducing the amount of residual sulfur in diesel and gasoline. These directives are requiring European refineries to revise both their fuel production processes and their downstream desulfurization strategies. One affected refinery is Irish Refining plc near Whitegate Middleton, Country Cork, Ireland which recently added a new atmospheric pipestill and expanded their existing gas oil hydrofiner. After the changes, the refinery could meet the new sulfur directives in the produced gasoline and diesel however, the off gas from the gas oil hydrofiner which is added to the refinery fuel gas, would contain too much H2S to continue to be burned as a fuel.

Irish Refining evaluated several sulfur recovery options based on the following criteria: 3 to 1 gas flowrate turndown, 3 to 1 H2S concentration turndown, H2S outlet concentration of ≤10 ppmv, minimal operator attention, sulfur product suitable for agricultural use, and a reliable, proven process.

Irish Refining selected the LO-CAT® II Hydrogen Sulfide Oxidation Process is designed and manufactured by Merichem.

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