The currently favored technology for capturing CO2 from gasification processes is to selectively separate H2S and CO2 from “shifted” syngas, usually in a physical solvent absorption process such as Rectisol®. Air Products has substantial operational experience of this technology in Baytown, Texas.
Air Products is exploring an alternative CO2 capture option that capitalizes on our years of experience in the design and operation of H2 pressure swing adsorption (“PSA”) systems associated with our steam reformers. The non-selective separation of H2S and CO2 from H2, upon which the process is based, provides advantages over existing selective separation technologies, particularly when the process is integrated with a gas turbine for the production of electricity. The full system uses H2 PSA technology adapted to handle sour feedgas low-BTU oxyfuel burner technology and SO2, NOx, and inerts removal systems originally developed by Air Products for oxyfuel CO2 capture from power boilers based on pulverized coal combustion. The CO2 is captured by combusting the PSA offgas using oxygen.
CO2 capture from gasification schematic