| Summary: | 碩士 === 元智大學 === 化學工程與材料科學學系 === 102 === This paper did extraction reaction to separate Zn2+ and Cu2+ by using Supported Liquid Membranes with di(2-ethylhexyl) phosphoric acid for extractant and kerosene for thinner. The experiment changed different pore size, membrane concentration, pH of feed phase, pH of stripping phase and rotational speed to research the loss rate of ionic liquid. To measure loss of ionic liquid in real time, the system added Electrochemical Impedance Spectroscopy to analysis the impedance changeing about membranes.
The results of experimental show that the large pore size caused the resistance of membrane decreased. However, the separation factor depends on the thickness of liquid film. When the concentration of D2EHPA in extractant was down，the separation coefficient increased, but no effect on membrane impedance. The pH value of the extraction phase had the large effect when the concentration of membranes liquid decreased. In the case of thick membranes liquid, the smaller pH value in stripping phase was better for impedance and separation coefficient. When the rotation speed decreased, the separation factor fall but the value of membranes impedance rised. The thicker the membranes could contain more extraction. Finally, using stability constants decided the stability of membrane.
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