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LO-CAT® II process for H2s oxidation and sulphur recovery

Lubrizol’s facility in LeHarve, France produces a lube oil additive via a batch reaction that uses elemental sulfur as a reactant and produces H2S as a byproduct. Lubrizol selected Merichem’s LO-CAT® II Hydrogen Sulfide Oxidation Process to sweeten H2S emissions and recover sulfur.

The LO-CAT II system was chosen for its ability to handle the process variation in H2S concentration. During the 8-hour batch reaction cycle, H2S concentrations in the effluent gas range from 0 to approximately 100 percent. The cyclic rate of H2S entering the LO-CAT unit translates to a maximum instantaneous H2S rate of 10 tons/day (T/D), with average daily H2S loading equivalent of just 3 T/D.

The LO-CAT II Oxidation System produces good quality elemental sulfur, which is recycled as feed stock to the batch reactors. During each cycle, approximately 3,000 kg of sulfur is produced and recycled from the LO-CAT II unit and directed back to the batch processes. The sulfur is 99+% pure and less than 200 ppm (wt.) ash.

The LO-CAT system has performed its dual processes effectively since startup in June 1996, handling a turndown requirement that few other H2S removal processes can tolerate and saving Lubrizol money by recycling elemental sulfur. H2S emissions were reduced from 820,000 ppmv to less than 10 ppmv.

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