CCS and Power Systems

Carbon Capture - Post-Combustion Capture

Low-Energy Solvents for Carbon Dioxide Capture Enabled by a Combination of Enzymes and Ultrasonics

Project No: FE0007741

Project Description

Novozymes North America, Inc. (Novozymes) has teamed with the University of Kentucky, Doosan Power Systems, Ltd., and Pacific Northwest National Laboratory (PNNL) to design, build, and test an integrated bench-scale CO2 capture system that combines the attributes of the bio-renewable enzyme catalyst carbonic anhydrase (CA) with low-enthalpy absorption liquids and novel ultrasonically-enhanced regeneration. This unique CO2 capture system is expected to achieve improved efficiency, economics, and sustainability in comparison with existing CO2 capture technologies. 

The capture process will use a potassium carbonate solvent with low regeneration energy coupled with CA as a catalyst to promote higher rates of absorption in the carbonate solution. The application of ultrasonic energy forces dissolved CO2 into gas bubbles, thereby increasing the overall driving force of the solvent regeneration reaction. Additionally, through ultrasonics, a coupled effect of rectified diffusion is also believed to have the potential to drive dissolved CO2 into gas bubbles at pressures greater than the equilibrium pressure for CO2 over the solution. The combination of these synergistic technologies is projected to reduce the net parasitic load to a coal-fired power plant by as much as 51 percent compared to conventional monoethanolamine (MEA) scrubbing technology.

The project team will build on previous laboratory tests of the novel solvent and CO2 recovery technique to obtain additional laboratory data sufficient to design a bench-scale system and perform a final analysis of the technology. This bench-scale study will validate the potential of the system to provide a low cost of energy solution for post-combustion CO2 capture.

Project Details