Showing papers by "Takeshi Kataoka published in 1973"

Liquid phase mass transfer in ion exchange based on the hydraulic radius model

Abstract: Applying the hydraulic-radius model to the flow in a packed bed, ion exchange liquidphase mass transfer is analysed and liquid-phase effective diffusivity, De'', based on the model is compared with the diffusivity, De, based on the film model. The maximum difference between these values was about 5% for the range of diffusivity ratio a>1 and 16% for a<1. Therefore, even if the value of De is used as an approximation, no significant error will appear. Furthermore, experimental results were correlated by the use of individual diffusivity for isotopic ion exchange and De'' for mutual ion exchange. These data satisfy the equationJ*'' ={(1-e)/e}1/3 k*Sc2/3£/us=1.85Re''-2/3, when Re''<100.

Mass transfer in ion exchange by liquid anion exchanger

Abstract: To clarify mass transfer mechanism in ion exchange by liquid anion exchanger, theoretical equations for rate of ion exchange were derived by applying the Nernst-Planck model for diffusion of an ion in aqueous phase. Furthermore, rates of ion exchange in a few exchange systems of simple anions were measured with a liquid-liquid jet apparatus with two immiscible falling liquids. From these results, it was found that the rate of ion exchange by liquid anion exchanger was not affected by non-counter ion, and could be expressed quantitatively with theoretical equations considering the electric field when diffusivities of counter ions are not equal.