TDA Research Inc. will work with Membrane Technology and Research, Inc. (MTR), Technology Centre Mongstad (TCM), Gas Technology Institute, and the University of California Irvine to design, construct, and operate an engineering-scale (1 MWe) hybrid post-combustion carbon dioxide (CO₂) capture system, combining a polymeric membrane and a low-temperature physical absorbent. The polymer membrane removes the bulk of the CO₂ in the flue gas across a relatively low pressure gradient, reducing the power consumption and cost of capture. The membrane residue gas is further treated by the sorbent, ensuring greater than 90 percent CO₂ capture overall. The sorbent is regenerated using the coal boiler air intake, and the CO₂-laden air is fed to the boiler, generating a CO₂-rich flue gas that further increases the driving force across the membrane. In a previous U.S. Department of Energy (DOE)-funded Small Business Innovative Research project, the sorbent formulation was optimized and operation of the hybrid process was evaluated at bench scale using a slipstream of actual coal-derived flue gas. A preliminary techno-economic analysis (TEA) showed a substantial improvement in net plant efficiency (~3.5 percent increase on higher heating value basis) compared with the state-of-the-art amine-based CO₂ capture system. For this project, the team will design a 1-MWe modular pilot unit with the support of computational fluid dynamic simulations. Based on the final design details, the membrane-sorbent hybrid test unit will be fabricated, following modifications to MTR’s existing 1-MWe two-stage membrane skid and the construction of TDA’s modular sorbent skid. A 9- to 12-month test campaign will be performed at TCM on the field unit using an industrial flue gas that closely resembles coal-fired flue gas to evaluate the system’s performance at different operating conditions and achieve a minimum of 6,000 hours of continuous operation. The test results will be used to update the membrane performance data and the TEA, as well as to provide an environmental health and safety assessment for the technology.