1984 Volume 10 Issue 4 Pages 415-420
For the purpose of examining the influence of ionic migration on the absorption rate of carbon dioxide by aqueous solutions of sodium hydroxide, the proper diffusion equations were written for all species present in the liquid phase with the inclusion of an ionic migration term. The system was solved through finite difference numerical computations, under both isothermal and adiabatic conditions. The validity of our analysis was confirmed by absorption experiments conducted in a wetted-wall column. We have also made a detailed comparison of our theoretical and experimental results with theoretical results previously reported in the literature. It was found that, through the present method of analysis, the absorption rate can be predicted on an almost quantitative basis even in the case of concentrated solutions, something not previously achieved by other methods of theoretical analysis. It was clarified that sodium ion, in spite of its chemical inertness, considerably lowers the absorption rate due to its finite migration rate.