The biomimetic CCS strategy is based on the enhancement of CO2 absorption rate into aqueous solutions catalysed by the enzyme Carbonic Anhydrase (CA). This strategy may provide an environmental friendly alternative to amine-based CO2 capture. Most of the technical solutions for biomimetic CCS ask for the biocatalyst immobilization. However, careful design of the absorption unit must ensure effective absorption enhancement by heterogeneous biocatalysis. The immobilization of CA on fine dispersed solids promotes the heterogeneous biocatalysis close to the gas-liquid interface and the absorption rate enhancement. The present work proposes a theoretical model of a slurry absorption unit for the biomimetic CO2 capture. The model includes mass balances based on the two films theory. Main assumptions adopted for the model development are: counter-current operation of gas and slurry in a staged bubble column (SBC) described according to the ‘tanks in series’ model; slurry phase modelled according to the pseudo-homogeneous approach. SBC was selected as one of the possible configurations of counter-current gas-liquid equipment able to handle slurry phases. Model computation showed reasonably prediction of CO2 capture extent in biomimetic absorption with both free and immobilized CA catalysis.

MODELLING OF SLURRY ABSORBER FOR BIOMIMETIC CO2 CAPTURE

Bareschino P;
2014

Abstract

The biomimetic CCS strategy is based on the enhancement of CO2 absorption rate into aqueous solutions catalysed by the enzyme Carbonic Anhydrase (CA). This strategy may provide an environmental friendly alternative to amine-based CO2 capture. Most of the technical solutions for biomimetic CCS ask for the biocatalyst immobilization. However, careful design of the absorption unit must ensure effective absorption enhancement by heterogeneous biocatalysis. The immobilization of CA on fine dispersed solids promotes the heterogeneous biocatalysis close to the gas-liquid interface and the absorption rate enhancement. The present work proposes a theoretical model of a slurry absorption unit for the biomimetic CO2 capture. The model includes mass balances based on the two films theory. Main assumptions adopted for the model development are: counter-current operation of gas and slurry in a staged bubble column (SBC) described according to the ‘tanks in series’ model; slurry phase modelled according to the pseudo-homogeneous approach. SBC was selected as one of the possible configurations of counter-current gas-liquid equipment able to handle slurry phases. Model computation showed reasonably prediction of CO2 capture extent in biomimetic absorption with both free and immobilized CA catalysis.
978-88-88198-37-8
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12070/9663
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