A STUDY ON THE CONTINUOUS CONCENTRATION PROCESS WITH LIQUID SURFACTANT MEMBRANE TECHNIQUE IN A COUNTERCURRENT CONTACT COLUMN

1.建立了液膜透过苯酚的传质模型。根据该模型，计算机模拟渗透率所需的所有参数都可以从操作条件和(W/O)乳状液滴和内部水滴的直径中估算出来。该模型对各种条件下的间歇渗透实验结果进行了令人满意的预测。利用搅拌槽在不同条件下进行了LIX64N对铜离子的间歇渗透和D2EHPA对锌离子的间歇渗透浓缩实验。将实验结果与文献[1]中提出的传质模型推广到金属离子渗透的计算结果进行了比较。结果表明，该模型适用于液态表面活性剂膜对金属离子的渗透。应用连续相的轴向分散模型和(W/O)乳状液分散相的传质模型，模拟了络合萃取剂在逆流接触柱中连续浓缩二价金属离子的过程。考察了操作参数对柱内浓度分布的影响。可见，连续相中pH的控制对于高效运行是非常重要的，并且可以模拟以前报道的浓度分布。采用液膜分离技术，研制了一套连续破乳装置，对流经两个平行穿孔铜电极之间的W/O乳状液施加高直流电势。结果表明，乳状液具有良好的破乳效果，在乳状液投加量与破乳率相等的条件下，破乳率的平方与外加电位成正比增加，与电极间距无关。

1. A mass transfer model for the permeation of phenol by liquid srufactant membrane was proposed. According to the model, all parameters required for a computer simulation for the permeation rate can be estimated from operating conditions and diameters fo (W/O) emulsion drops and internal water droplets. The model satisfactorily predicts experimental results for the batch permeation measured at various conditions.2. Batch permeation and concentration experiments of copper ion by LIX64N and zinc ion by D2EHPA were carried out using a stirred tank at various conditions. The experimental results were compared with the results computed by extending the mass transfer model proposed in 1. to the permeation of metal ions. It was found that the model can be applied to the permeation of metal ions by liquied surfactant membranes.3. The continuous concentration process of divalent metal ions by chelate extractants in a countercurrent contact column was simulated by applying an axial dispersion model for a continuous phase and the above mass transfer model for a dispersed phase of (W/O) emulsion. The effect of operating parameters on the concentration profiles in the colunm was examined. It became clear that the control of pH in the continuous phase is very important for the efficient operation and the observed concentration profiles reported before can be simulated.4. A continuous demulsification equipment applying high DC electric potential to W/O emulsion passing between two parallel perforated copper electrodes was produced for the separation process by the liquid surfactant membrane technique. It was shown that the emulsions are demulsified well, and at the condition when the feed rate of emulsion is equal to the demulsification rate, the square of the demulsification rate increases in proportion to the applied potential and is independent of the distance between two electrodes.