The Study Of Mass Transfer Performance Of HFRLM Applied To The Extraction Of The Copper(Ⅱ) In Aqueous Solution

Liquid membrane processes is a special separation technology which combined advantages of the solid membrane processes and liquid-liquid extraction process. Since the end of 1960s when liquid membranes were introduced by Li and Shrier, liquid membranes have been proposed as a new technology for the selective separation, purification, and concentration of metals in aqueous solutions, organic acids, bio-products, and dissolved gases. However, in spite of the mentioned technical advantages of liquid membranes, there have been no commercial and industrial applications of liquid membrane due to their instability which is a complicated process and the subject of many studies. It is, in fact, the loss or deterioration of the organic liquid phase, which causes the instability, and it may be ascribed to several plausible mechanisms, such as solubility, emulsion formation and osmotic pressure difference.Hollow Fiber Renewal Liquid Membrane (HFRLM) is a new LM wherewith the affinity of hollow fiber membrane and solvent, the solvent phase will form a very thin layer of liquid membrane on one sides of hollow fiber membrane which can compart the feed phase and strip phase, then solute can be selectively transferred from feed phase to strip phase. This technology retains the advantage of non-equilibrium mass transfer of liquid membrane, at the same time, it overcome the disadvantage of supported liquid membrane(SLM) and avoids the complexity of emulsion liquid membrane(ELM).In this study, experiments were carried out with a system as CuSO₄-10% P204(in kerosene solution)-hydrochloric acid to investigate the mass transfer mechanism and to analysis the influence of different operation conditions in HFRLM process, the total mass transfer coefficient of HFRLM with that of HFSLM was compared.From the experimental data, the mass transfer coefficient of each phase was obtained, and suggested the mass transfer model well.Based on research results, the conclusions were supplied for further studying on mass transfer mechanism and the application of HLRLM technology.