Print: | ISSN 0256-1115 |
Online: | ISSN 1975-7220 |
Korean Journal of Chemical Engineering,
Vol.14, No.5, 312-320, 1997 Facilitated Transport of Carbon Dioxide through an Immobillized Liquid Membrane of K2CO3/KHCO3 Aqueous Solution
The facilitated transport of CO2 through a hydrophilic polymeric membrane immobilized with K2CO3/KHCO3 buffer solution has been investigated. The reaction of dissolved CO2 in electrolyzed alkaline solution must consider hydration of CO2 with water, chemical reaction of CO2 with OH- and dissociation of HCO3- into CO32-. It is necessary to simplify these reactions as a simple model, which is used to analyze the transport system. From experiments in the liquid membrane with alkaline buffer solution, it si shown that the flux of CO2 into K2CO3/KHCO3 aqueous solution can be enhanced by the presence of CO32-. A diffusion model with an overall reaction based on the film theory is proposed that proposed that predicts the experimentally observed facilitation factor with resonable accuracy. The present model is compared with the rigorous diffusion model involving the complicated conventional chemical reactions.
Keywords:
Facilitated Transport; Alkaline Buffer Solution; CO2; Film Theory Immobilized Liquid Membrane
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