CCS and Power Systems
Carbon Capture - Post-Combustion Capture
Bench-Scale Development of a Hot Carbonate Absorption Process with Crystallization-Enabled High Pressure
Performer: University of Illinois
Project No: FE0004360
The University of Illinois at Urbana-Champaign has partnered with Energy Commercialization, LLC to investigate the use of a Hot Carbonate Absorption Process (Hot-CAP) with crystallization-enabled, high-pressure stripping for post-combustion CO2 capture. The process uses a carbonate salt (potassium or sodium carbonate) as a chemical solvent to remove CO2 from flue gas. The carbonate solvent absorbs CO2, as well as SO2 and other acid gases, in a high-temperature (70–80°C) absorption column; the CO2-rich solvent undergoes treatment to crystallize and separate the bicarbonates formed, and the resulting slurry is sent to a high-pressure stripping column which removes the CO2 and recycles the solvent. Calcium sulfate is recovered separately as a byproduct of SO2 removal. The Hot-CAP offers the potential to significantly reduce the energy penalty compared with the monoethanolamine (MEA) process; a preliminary techno-economic evaluation has shown that energy use with the Hot-CAP is about half that of its MEA counterpart due to reduced steam requirements and compression costs. Successful optimization of this technology will show promise to meet or exceed DOE’s technical and cost goals.