A Combined Mass Transfer Coefficient Model for Liquid-Liquid Systems under Simultaneous Effect of Contamination and Agitation

Abstract

The simultaneous effect of contamination and agitation was investigated using a pilot rotating disc contactor and mass transfer in both directions with single drops in the absence of drop break‐up and coalescence. It is ideally required to account for the extent of contamination in a quantitative manner and in both phases with a single parameter. In this work, a combined mass transfer model is applied and an improvement is made using an empirical coefficient and having mathematical consistency. Based on 120 experimental data series obtained for each mass transfer direction, a correlation is proposed for the coefficient of this model.

Low interfacial tension liquid–liquid extraction with impinging-jets contacting method: Influencing parameters and relationship

“…9, it is obvious that the rate of mass transfer for the organic to aqueous direction is more than the inverse direction which does conform the results previously reported in a rotating disc contactor (RDC) using single drop experiments with the same chemical system [12] and the chemical system of TAW [16]. It is notable that since the local mass transfer coefficients are unknown, it is difficult to predict this result with theoretical aspects, for instance mass transfer resistance in each phase.…”

“…Analysis of succinic acid in organic phase was carried out by adding the accurately measured volume of samples (1 mL) to large excess water (20 mL) and titration using 0.01 N solution of sodium hydroxide [12].…”

“…2). [10] 0.52 Â 10 À9 0.22 Â 10 À9 Interfacial tension between saturated phases (g), (mN m À1 ) [12] 2.010 Interfacial tension between saturated phases with 5 kg m -3 of succinic acid (g), (mN m À1 ) [13] 2.092…”

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

“…The eddy diffusion contribution increases as drop size (and therefore its velocity) increases. Young and Korchinsky [24], Slater [15], Ghalehchian and Slater [13] and Saien and Barani [17] have proposed alternative effective diffusivity models. It has been attempted to describe the effect of adsorbing species in both phases with a single parameter.…”

“…Slater's purpose was to develop a combined model that is capable of including this retarding effect in the overall mass transfer coefficient through only one parameter with the advantage of its ease of application. On the other hand, due to some inconsistencies in the mathematical aspects of the combined model, several alternatives have been proposed for this model which are mainly based on experimental data [13,[16][17][18][19][20].…”