Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 36, Pages 13672-13682Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c03497
Keywords
amines; amino acid; carbonic anhydrase; CO2 capture; ionic liquid; proline; pentaethylenehexamine; methyl diethanolamine
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Funding
- European Union's Horizon 2020 research and innovation programme [760431]
- Swedish Energy Agency [44671-1]
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The influence of carbonic anhydrase (CA) on the CO2 absorption rate and CO2 load in aqueous blends of the amino acid ionic liquid pentaethylenehexamine prolinate (PEHAp) and methyl diethanolamine (MDEA) was investigated and compared to aqueous monoethanolamine (MEA) solutions. The aim was to identify blends with good enzyme compatibility, several fold higher absorption rates than MDEA and superior desorption potential compared to MEA. The blend of 5% PEHAp and 20% MDEA gave a solvent with approximately five-fold higher initial absorption rate than MDEA and a two-fold higher regeneration compared to MEA. Experiments in a small pilot absorption rig resulted in a mass transfer coefficient (KGa) of 0.48, 4.6, and 15 mol (m(3) s mol fraction)(-1) for 25% MDEA, 5% PEHAp, 20% MDEA, and 25% MEA, respectively. CA could maintain approximately 70% of its initial activity after 2 h incubation in PEHAp MDEA blends. Integration of CA with amine-based absorption resulted in a 31.7% increase in mass of absorbed CO2 compared to the respective non-enzymatic reaction at the optimal solvent: CA ratio and CA load. Combining novel blends and CA can offer a good compromise between capital and operating costs for conventional amine scrubbers, which could outperform MEA-based systems.
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