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Combined CO2 mitigation and H2S removal

By Gerald Ondrey |

Last month at the Global Refining Summit (Rotterdam, the Netherlands; May 17–19), Swapsol Corp. (Monmouth Junction, N.J.; www.swapsol.com) introduced a completely new sour-gas-cleanup process that reduces hydrogen sulfide levels below detectable levels (under 4 ppb) while reacting with carbon dioxide to form water, sulfur and a polymer of sulfur and carbon (carsul). Although still in the laboratory stage of development, the process promises to have application in cleaning up landfill gas, sour-gas, fluegas and Claus tailgas, as well as serving as an alternative to Claus technology, says COO Wolf Koch. Swapsol has applied for U.S. and international patents on all aspects of its technology. Named after its discoverers, the Stenger-Wasas Process (SWAP) involves the reaction of H2S and CO2 at temperatures of 70–200°C and ambient to moderate pressures. The exothermic reaction is carried out in a catalyst-packed tubular reactor and produces sulfur, water and carsuls. The catalyst is a naturally occurring mineral ore that is pretreated in a manner analogous to common hydrotreating catalysts, says Koch. Sulfur can be recovered from carsul by simply heating it, leaving behind a polymer of carbon that may have applications as…
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