Modelling mass transfer coefficient for liquid-liquid extraction with the interface adsorption of hydroxyl ions

Abstract

A combined model was used for prediction of overall mass transfer coefficient of drops in the liquid-liquid extraction process, prone to the deleterious effect of adsorbed hydroxyl ions onto the interface. The importance is due to the use of different pH waters as aqueous phase. The work is based on single drop experiments with a chemical system of toluene-acetone-water where the pH of the continuous aqueous phase was within the range 5.5-8, appropriate to most industrial waters, and can lead to rigid behavior of circulating drops. The combined model in conjunction with the correlation developed here for the ratio of interfacial velocity to drop terminal velocity that links the film mass transfer coefficients of both sides can be used satisfactorily for design purposes. This model gives a maximum relative deviation of less than ±10% for the mass transfer directions of dispersed to continuous phase and vice versa.

Effect of aqueous phase pH on liquid–liquid extraction with impinging-jets contacting technique

“…In the continuity of our previous works [6,7], concerning the influence of aqueous phase pH on the extraction process with drop dispersion method, an attempt is made here to investigate the influence of aqueous phase pH on the extraction efficiency and the rate of mass transfer, using an efficient impinging jets contactor instead of conventional devices. In a number of previously published articles by Berman and Tamir [8], and Dehkordi [9][10][11][12]; in addition to our recent work [13], the great potential of impinging jets technique for the liquid-liquid extraction process has been demonstrated.…”