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在液-液萃取过程中,提高分散相的表面更新速率可有效提高萃取的传质效率。研究发现,在萃取过程中使用气体搅拌可以增加液液之间的接触面积,促进液相内的湍动和循环。本文研究了气-液-液三相下油滴的流动形态,并对不同填料的流体力学性能进行了测定。实验结果表明,气相速度的增加可导致气含率、液含率的增加,从而提高分散相在填料萃取塔中的停留时间,在一定的速度范围内明显降低萃取的表观传质单元高度,极大地强化传质效果。通过与散装填料对比,发现规整填料更利于强化萃取效果,其液泛速度平均增加25%。
In liquid-liquid extraction, increasing the surface renewal rate of the dispersed phase can effectively improve the mass transfer efficiency of extraction. The study found that the use of gas mixing in the extraction process can increase the contact area between the liquid and liquid to promote turbulence and circulation in the liquid phase. In this paper, the flow patterns of gas-liquid-liquid three-phase oil droplets are studied, and the fluid mechanics properties of different fillers are measured. The experimental results show that the increase of gas phase velocity can lead to the increase of gas holdup and liquid holdup, so as to increase the residence time of disperse phase in the packed column, decrease the height of apparent mass transfer unit obviously in a certain speed range, Greatly enhance the mass transfer effect. Through the comparison with the bulk packing, it was found that the structured packing is more conducive to the enhancement of the extraction effect, and the flooding speed is increased by 25% on average.