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In this work the dispersed phase mass transfer coefficient from a continuous phase has been
determined experimentally. Five needles are used to produce different drop sizes at the needle tip.
In two chemical systems, Toluene (dispersed) ¬Acetic Acid (Solute)-Water(Continuous), and Butanol (dispersed) - Acetic Acid (Solute) ¬Water (Continuous), all mass transfer resistances
were considered within the dispersed phase. The extrapolation of mass transfer to zero height or
zero rising time is used to find the formation mass transfer coefficient. The results are compared with
those of different models. The efficiency of the first chemical system was between 0.22 and 0.86
and the second one was between 0.035 and 0.275. Our study showed that the diffusion model can be
used for the first system, where as the internal circulation model is applicable to the second one.
Generally the size of drops must be considered as the most important parameter in determing the
dispersed phase mass transfer coefficient:¬