A simulation model was proposed to predict the trivariant drop distribution and mass-transfer rate for liquid-liquid dispersion systems, using the concept of drop population balance. The rates of changes in solute concentration and drop volume due to solute transfer were calculated by solving the moving boundary diffusion model in spherical coordinates. The diffusion equation was solved by both numerical and modified methods, and both results were found to be almost identical. The simulation results were compared with reported experimental data and calculated data for the systems without mass transfer, and good agreement was found between them. This agreement confirms that the simulation model can be extended to the systems with mass transfer.A new flow dynamic apparatus for measuring liquid-phase diffusion coefficients is shown to reproduce literature data. An important modification of the classic capillary diffusion tube is shown to give quick, reliable results using a minimum quantity of reagents. New data for the diffusion of m-xylene in o-xylene are also presented.
The mass transfer rate during drop formation was measured by an experimental methodin which a continuousphase adder was used. The continuous phase was circulated in the columncounter-currently to the drop phase, and the distance between the nozzle tip and the drop collector was kept short. Fromthe data obtained in four binary systems a best drop size prediction model was chosen, and the model was applied to four ternary systems for obtaining interfacial tension during mass transfer. The drop size was correlated in terms of solute molar flux, nozzle size, and density difference between the dispersed and continuous phases. Also, the inter facial tension change was correlated with solute molar flux. The two correlation equations gave good predictability for the systems in this study.
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