Carbon Capture from Gasification

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