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.
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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 and Staff Publications. 26.