Mass transfer characteristics of CO2 absorption by deep eutectic solvents/water mixtures in microchannel reactor
In order to explore the application of deep eutectic solvents(DESs)in CO2 absorption processes,mass transfer characteristics of CO2 absorption by DESs/water mixtures in the Advanced Flow Reactor of Corning were studied,and the results were compared with those of commonly used CO2 absorbents(30%mass fraction of N-methyldiethanolamine aqueous solution).The results show that when the liquid volume flow rate qV,L of the DESs/water mixture absorbent is kept constant,the absorption load of the reaction and volume mass transfer coefficient increase with the increase of gas volume flow rate qV,G.The absorptivity increased with qV,G at low qV,G,and at high qV,G the change of absorptivity became less obvious.When qV,G was kept constant and qV,L increased,the absorption load and volume mass transfer coefficient decreased,but the pressure drop increased.The absorptivity decreased with the increase of qV,L at low qV,L,and at high qV,L the change of absorptivity was also not obvious.By taking the gas/liquid Re number,Sc number of liquid phase and enhancement factor into account,the correlations for volumetric mass transfer coefficient and pressure drop were established with the average absolute deviations of 4.19%and 1.74%,and the maximum absolute deviations of 13.9%and 11.7%,respectively.
deep eutectic solventsmicrochannel reactorCO2 absorptiongas-liquid flow
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