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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。据此,本文在气-液-液萃取条件下对不同填料的传质性能进行了测定。实验表明,通入气相后分散相液滴呈现稳定的“油包气”空心状态,这种结构大大降低了分散相液滴的传质层厚度,减小了传质距离,极大地强化传质效率。在适宜气速下,气-液-液萃取效率较传统萃取效率提高20%~40%。通过与散装填料对比,发现规整填料更利于强化萃取效果,传质效率提高约50%。
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. Based on this, the mass transfer performance of different fillers was tested under gas-liquid-liquid extraction conditions. The experimental results show that the dispersed droplets in the dispersed phase exhibit a stable “gas-in-air” hollow state after passing into the gas phase. This structure greatly reduces the mass transfer layer thickness of the dispersed phase droplets, reduces the mass transfer distance and greatly strengthens Mass transfer efficiency. Under appropriate gas velocity, gas-liquid-liquid extraction efficiency is 20% ~ 40% higher than traditional extraction efficiency. Through the comparison with the bulk packing, it is found that the structured packing is more conducive to enhancing the extraction efficiency, and the mass transfer efficiency is improved by about 50%.