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Comment Processing & Handling

Lower-cost sulfur-removal process for syngas goes commercial

By Scott Jenkins |

An adsorbent-based, sulfur-removal process for synthesis gas (syngas) that lowers capital and operating costs compared to alternative methods of removing sulfur has completed pre-commercial testing and has achieved commercial status. The Warm-gas Desulfurization Process (WDP; diagram) has been under development by Research Triangle Institute (RTI; Research Triangle Park, N.C.; www.rti.org) for over 10 years, and is now commercially available through RTI’s partner Casale S.A. (Lugano, Switzerland; www.casale.ch). A proprietary solid-sorbent material critical to the process is now being manufactured by another RTI partner, Clariant (Muttenz, Switzerland; www.clariant.com). RTI says that the WDP technology consistently reduced inlet total sulfur by 99.8–99.9% in raw syngas with sulfur concentrations as high as 14,000 parts per million (ppm). Further, integration of WDP with CO2-capture systems can reduce sulfur to parts-per-billion levels, according to RTI, which renders the syngas suitable for chemicals-, fertilizer- and fuel-manufacturing processes. “Removing sulfur at warm process temperatures contributes to increased efficiencies and lower operating and capital expenditure,” RTI says. To remove sulfur from syngas, WDP uses…
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