Single-drop mass transfer in the water-toluene-acetone system

Abstract

An experimental study of fundamental mass-transfer characteristics was carried out in which acetone was transferred between water and toluene. All possible arrangements were involved; i.e., acetone was transferred in both directions, and both water and toluene were used as dispersed phases. With technical-grade solvents, the transfer rates were 2-10 times higher than calculated for rigid spheres, and on increasing the system purity, this increase grew to between 30 and 70 times. A previously derived empirical equation describes the low transfer rate results, while for the other case only rough estimations are possible due to the extreme sensitivity to small amounts of impurity.

Transient rise velocity and mass transfer of a single drop with interfacial instabilities – experimental investigations

“…In this configuration, mass transfer is higher if acetone is transferred from the dispersed phase into the continuous phase. Temos et al (1996) confirmed the enhancement of mass transfer when the solute transfer direction is d → c. In order to describe the increased mass transfer due to interfacial instabilities, Steiner et al (1990) introduce an effective diffusivity, Henschke and Pfennig (1999) describe the enhanced mass transfer with an "instability constant" which has to be identified in single-drop experiments. Schulze et al (2003) confirmed the chaotic flow structure inside drops due to Marangoni convection in decolourization experiments.…”

“…Concerning moving drops, Steiner et al (1990) reported that mass transfer enhancement in the toluene/acetone/water system is strongly dependent on the mass transfer direction. Higher rates were obtained if toluene is the dispersed phase.…”

Validated simulation of droplet sedimentation with finite-element and level-set methods

“…Alves et al (2005) applied the stagnant-cap model on experimentally obtained terminal velocity values of air bubbles rising in water in order to take the effect of bubble contamination on rise velocity and mass transfer into account. Large droplets that are important in engineering applications were studied experimentally by various authors (Hendrix et al, 1967;Mekasut et al, 1979;Steiner et al, 1990). Based on the experimental results these papers also treat modelling issues.…”

Measurement and Correlation of the Mass Transfer Coefficient for a Liquid-Liquid System With High Density Difference

“…Thus, the modified model can be applied in circulation conditions or even oscillation conditions. Steiner (1986 and1990) tested this method with numerous data and further correlated the empirical factor against the physical properties. Both Saien et al (2012) and Sun et al (2014) used this correlation to predict the mass transfer process in their works.…”