SRI International, in collaboration with OLI Systems, Inc., Aqueous Systems ApS, Politecnico di Milano (POLIMI), and Stanford University, will advance the development of a novel ammonia-based mixed-salt solvent process for carbon dioxide (CO₂) capture from coal-fired power plants by designing and testing a bench-scale (approximately 100 kW) CO₂ capture system. The mixed-salt technology combines ammonium and potassium carbonates for enhanced CO₂ capture efficiency, high CO₂ loading capacity, and reduced energy consumption. The high operating pressure of the solvent regenerator also has the potential to reduce the CO₂ compression costs. The technology consists of a two-stage absorber system with a single stage regenerator. To improve process performance, the absorber conditions will be optimized using two individual absorbers before testing the single two-stage absorber. Individual absorber and regenerator tests will be performed in a semi-continuous mode to collect data on solvent concentration, CO₂ capture efficiency, water usage, and ammonia loss. Bench-scale testing of the continuous, integrated two-stage absorber system will be performed using simulated flue gas. Data collected will be used to complete thermodynamic modeling and a techno-economic analysis for integration of the mixed-salt technology into a full-scale power plant.