The initial mass transfer rate of acetic acid from the aqueous to the organ
ic phase with tri-n-octylamine and toluene or isododecane as solvents has b
een studied in a constant interfacial cell area as a function of the stirri
ng speed, concentrations of the transfer species, and the influence of chem
ical adsorption layers. For a detailed understanding of the mass transfer p
rocess, the electrophoretic mobility of oil-in-water droplets for these sys
tems has been measured with a ZETA-sizer. The electrophoretic mobilities of
the different reactive extraction systems were investigated for their depe
ndence on the pH value and with different interfacial charges. It was prove
d that a change of the interfacial charge influences the zeta potential of
the dispersed oil drops in the same way as the reaction kinetics, and thus
the mass transfer of acetic acid.