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Recently, the Institute of Process Engineering of the Chinese Academy of Sciences has made progress in the theory and application of mass transfer enhancement of liquid-liquid extraction towers
.
Researchers combined the radial rotating flow field and the axial cross flow field to form a composite flow field, which strengthened the mass transfer process between liquid and liquid phase, and developed a new type of "stirring-pulse" extraction tower, with the number of mass transfer units per meter Up to 10~15 levels, which can more than double the efficiency of traditional extraction towers, and have been applied in the fields of chemical pharmacy, industrial wastewater treatment and hydrometallurgy
.
The basic research, development and application of this new type of extraction tower are of great significance for promoting the upgrading and replacement of key solvent extraction devices in China, as well as the green and safe production of related industries
The researchers introduced high-speed radial stirring and axial pulse two external energies into the extraction tower at the same time, which increased the full break-up frequency of the dispersed phase droplets and strengthened the material transfer between the liquid and liquid phases; combined with the specific structure of the tower The plate, while ensuring the liquid-liquid two-phase countercurrent flow, suppresses the degree of axial backmixing
.
Subsequently, from the perspective of droplet breaking and coalescence, the researchers obtained experimental data of single droplet and droplet group behavior through high-speed camera technology, established a group balance model describing the evolution of the droplet diameter in the extraction tower, and further solved it.
The researchers innovatively combined the step tracer method with the self-designed L-type sampler to overcome the problem of discontinuity and difficulty in detecting the dispersed phase
.
Studies have shown that in the stirred pulse extraction tower, the axial diffusion coefficient of the continuous phase is 1 to 3 times the axial diffusion coefficient of the dispersed phase
