Effects of Flow Rate Ratio on Dioxouranium VI Extraction

3 Effects of Flow Rate Ratio on Dioxouranium(VI) Extraction 

The effect of the phase flow rate ratio on the dioxouranium(VI) extraction in the 0.5 mm ID channel is shown in Fig. 6.9. For these experiments the total volumetric flow rate (Qmix) was kept constant at 14.6 cm h while the ratio of TBP/CL mixture to the aqueous phase was varied from 0.25 to 1. According to the stoichiometry of the reaction even in the case of 0.25 phase ratio, TBP is stiU in excess for the extraction of dioxouranium(VI) from the nitric acid solution. The length of the microchannel was 10 cm. The corresponding flow patterns were recorded and two indicative pictures (for extraction with 3 M nitric acid concentration) for the lowest and highest ratio i.e. 0.25 and 1 are shown in Fig. 6.9, for initial nitric acid 

6 Liquid-Liquid Mass Transfer Using Ionic Liquids 

For initial nitric acid concentration of 3 M the decrease of %E with flow rate ratio is more obvious than for 1 M maybe as a result of the change of the extraction mechanism the mass transfer at 3 M is more dependent on the mixing of the transferred species within a phase and the kinetics of the complex formation than on interfacial area. 

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