(73e) The Enhancement of Liquid-Liquid Extraction Performance By Using Hollow Oil Droplets with Microbubbles As Dispersed Phase

The Enhancement of Liquid-liquid Extraction
Performance by Using Hollow Oil Droplets with microbubbles as Dispersed Phase

Wenting Wang, Guotao Liu, Jing
Tan, Jianhong Xu*, Guangsheng Luo

State
Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University,
Beijing 100084, China

Micro-structured
chemical systems have become one of most important methods for realizing
greener, more efficient, safer and more controllable chemical engineering
processes, and they continue to show promise for the further development of
modern chemical industries. In this work, process intensification of
liquid¨Cliquid extraction with high phase ratio by forming G/W/O (gas in water phase
in organic phase) microdispersion system is carried out.

Extraction of solute
from an organic phase to an aqueous phase was selected as the model system. The
influence of the addition of gas phase as well as dispersion size on mass transfer
performance is investigated. The results show that both the increase in the
addition of gas phase and decrease in dispersion size lead to significant
enhancement in mass transfer performance, especially for the overall mass transfer
coefficient. As gas-to-water flow rate ratio increases from 25 to 600, the
overall volumetric mass transfer coefficient increases by nearly two orders of
magnitude. The calculation result shows good coincidence with experimental
values. The modeling investigation possibly leads to a further understanding of
the mechanism of process intensification of liquid¨Cliquid extraction process by
introducing microbubbles and forming G/W/O microdispersion system and also
helps the development of new extraction processes as well as design of
microdispersion devices with compactness and high efficiency.

Key words:
micro-dispersion; G/O/W double emulsion; liquid- liquid extraction; mass
transfer