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FE0013363 Abstract

Gasification is a promising alternative to traditional coal-fired combustion that can be adapted to carbon dioxide (CO2) capture while supplying synthesis gas (syngas) for hydrogen, power, or chemical products. A key challenge for coal gasification is to reduce its cost. Downstream processing of syngas for CO2 capture requires separation of the crude stream into the desired products (H2/CO), a sulfur stream (primarily H2S), and sequestration-ready CO2. The process most commonly employed for this is acid gas removal (AGR) based on absorption in a physical solvent. Air Products has developed a proprietary alternative that consists of two process blocks: Sour Pressure Swing Adsorption (PSA) that separates CO2 and H2S from the desired products, and a tailgas disposition block which separates the sulfur-containing compounds and purifies the CO2 to a sequestration-grade product. Sour PSA is the key enabler of the technology, but only limited testing of the adsorbent technology has been performed on high-hydrogen syngas streams. Through PSA testing and techno-economic assessment (TEA), Air Products has already successfully demonstrated a 4% reduction in COE from a low-rank coal-based, integrated gasification and combined cycle (IGCC) plant with CO2 capture. This project will be conducted in cooperation