环丁砜芳烃抽提体系界面性质的研究

采用悬滴张力仪和计算机图象采集系统研究了环丁砜芳烃抽提体系的界面性质及其对传质的影响。结果表明：在存在传质的条件下，相界面存在强烈的Marangoni现象。界面张力随芳烃浓度的增加而减小，但苯、甲苯和对二甲苯等组分的变化幅度不同。非平衡液的界面张力与组分所在的相及传递方向有关，平衡液的界面张力则与芳烃初始所在的相无关。实验还表明，非平衡液产生界面扰动所需的浓度与芳烃的分配系数(即Marangini数Ma)有关。传质推动力越大，Ma越大，界面扰动的程度也越剧烈。

Study on the Interfacial Characteristic of Sulfolane-Aromatic Extraction System

The interfacial characters of sulfolane-aromatic extraction system and its effect on mass transfer were studied. The results showed that the Marangoni effect is more significant when mass transfer exists. Interfacial tension decreases with aromatic concentration, and its change is different from each other. The interfacial tension of non-equilibrated phase is related to the direction of mass transfer and the phase where aromatics is located, but that of equilibrated phases is irrelevant to which phase the solute is located initially. The interfacial tension is inversely proportional to mass transfer driving force. The interfacial tension of benzene/heptane solution is the least, and xylene/heptane is the largest in aromatic/ heptane system. In aromatic/sulfolane system, interfacial tension of benzene is the largest, and the least is of xylene. Interfacial turbulence does not exist between two equilibrated phases. The concentration of non-equilibrated phases required for inducing interfacial turbulence is inversely proportional to mass transfer driving force. The higher the mass transfer driving force is, the larger Ma number and interfacial turbulence. Interfacial turbulence can improve mass transfer.