The novel small molecule carbonic anhydrase (CA) mimic [CoIII(Salphen-COO−)Cl]HNEt3 (1), was synthesized as an additive for increasing CO2 absorption rates in amine-based post-combustion carbon capture processes (CCS), and its efficacy was verified. 1 was designed for use in a kinetically slow but thermally stable blended solvent, containing the primary amines 1-amino-2-propanol (A2P) and 2-amino-2-methyl-1-propanol (AMP). Together, the A2P/AMP solvent and 1 reduce the overall energy penalty associated with CO2 capture from coal-derived flue gas, relative to the baseline solvent MEA. 1 is also effective at increasing absorption kinetics of kinetically fast solvents, such as MEA, which can reduce capital costs by requiring a smaller absorber tower. The transition from catalyst testing under idealized laboratory conditions, to process relevant lab- and bench-scale testing adds many additional variables that are not well understood and rarely discussed. The stepwise testing of both 1 and the novel A2P/AMP solvent blend is described through a transition process that identifies many of these process and evaluation challenges not often addressed when designing a chemical or catalytic additive for industrial CCS systems, where consideration of solvent chemistry is typically the primary goal.
Digital Object Identifier (DOI)
This work was supported by the U.S. Department of Energy (DE-FE0012926), and the Carbon 2 Management Research Group (CMRG): Louisville Gas and Electric & Kentucky Utilities, Duke 3 Energy, Kentucky Department for Energy Development and Independence, and the Electric Power 4 Research Institute, Inc.
Widger, Leland R.; Sarma, Moushumi; Bryant, Jonathan J.; Mannel, David S.; Thompson, Jesse G.; Lippert, Cameron A.; and Liu, Kunlei, "Enhancements in Mass Transfer for Carbon Capture Solvents Part I: Homogeneous Catalyst" (2017). Center for Applied Energy Research Faculty Publications. 26.