The Effects of a Surfactant Concentration on the Mass Transfer in a Mixer-Settler Extractor

The effects and influences ofvarious parameters upon the efficiency and the overall volumetric mass transfer coefficients are important subjects to be studied in most liquid-liquid extraction processes. one ofthese important parameters is surface active agent (surfactant). in thispaper, in order to study the effect ofsodium dodecyl sulfate (sds) concentration on the efficiency and the average overall volumetric mass transfer coefficients, several experiments were carried outin a ten stage mixer-settler. in these experiments the effect of surfactant concentration on abovementioned parameters at constant operational conditions are studied. in general the efficiency and mass transfer coefficients dropped significantly at low surfactant concentration and remainedalmost constant at the higher concentrations (almost a minimum point was observed). although the surfactant caused a decrease in mass transfer, but the amount ofmass transfer coefficients in bothphases are considerable and therefore the resistance against mass transfer in both phases cannot be neglected.