Developmental Study on a Liquid - Liquid Extractor with Supported Interface in a Porous Material

多孔材料支撑界面液-液萃取器的研制

基本信息

批准号：
02555190
负责人：
MUNAKATA Tsuyoshi
金额：
$ 1.86万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555190/
关键词：
Liquid-Liquid Extractin Extractor Mass Transfer Equipment Liquid-Liquid Interface Supported Interface

项目摘要

A liquid-liquid extraction equipment proposed here is a new type of mass transfer equipment keeping a liquid-liquid interface in a porous material through which each of the liquid can pass easily.In this reseach, using porous pipes made of wire netting the following two kinds of experiment were performed to examine the characteristics of this type of equipment. One is a fluid flow experiment for water-kerosene system to investigate on stability of the liquid-liquid interface supported in the porous pipe and the other is an extraction experiment using acetic acid as a solute.1. Fluid flow experiment The operating range keeping a stable interface was investigated for a few pipes made of wire netting of different mesh number. In the experiment, water flows downward in this pipe and kerosene flows upward in the outside annulus. The operating range was subjected to the difference between the static pressures of each phase and became wider with increase of mesh number of the wire netting. Th … More is result duggests that capillary pressure due to interfacial tension plays an important role. But the quantitative explanation can not yet been succeeded.2. Extraction experiment By adding acetic acid to water-kerosene system the interfacial tension decreased sharply and the operating range was found to become narrow. So the extraction experiment was conducted using only a wire netting pipe of mesh number-400, the finest one among the pipes used above. The experimental results were evaluated by the product of the overall mass transfer coefficient K_w and the interfacial area A. The K_wA value could be predicted to be between the estimated ones under assumption that the interface is at the outer face (hydrophilic) and the inner face (hydrophobic) of the porous pipe. From the estimated vakue of K_wA it was found that the mass transfer resistance in the porous wall is controlling and is less affected by the flow rate of water- and kerosene-phases. However, the experimental results of K_wA showed a few times the estimated ones, and increased slightly with increase of the water flow rate. On these results we consider that the bulk flow of water- or kerosene -phase may influence fluid movement within the porous wall and this promotes the mass transfer rate. Therefore we are planning to clarify the influence of the porous material used, its pore size and the wall thickness on the mass transfer rate. Less

这里提出的液体液体提取设备是一种新型的传质设备，将液态液体界面保持在多孔材料中，每种液体都可以轻松通过。一种是水甲苯系统的流体流实验，以研究多孔管中支撑的液态液界面的稳定性，另一种是使用乙酸作为固体的提取实验1。流体流量实验研究了几个由不同网格编号的电线网制成的管道，研究了保持稳定界面的操作范围。在实验中，该管道中的水流向下流动，煤油在外部环中向上流动。操作范围受到每个阶段的静压之间的差异，并随着电线网的网格数量增加而变得更宽。这是由于界面张力引起的毛细管压力的更多作用。但是定量解释还不能成功。2。提取实验通过在水甲苯系统中添加乙酸，界面张力急剧下降，并且发现工作范围变得狭窄。因此，提取实验仅使用网格编号-400的线网管进行，这是上面使用的管道中最好的。通过总传质系数K_W和界面区域A的乘积评估了实验结果A。可以预测K_WA值是在假设界面处于外部面（亲水性）和多孔管的内部面（疏水）的假设之间的估计值之间。从估计的k_wa的声音可以发现，多孔壁中的传质电阻是控制的，并且受水和煤油量的流量的影响较小。但是，K_WA的实验结果显示了几倍估计的结果，并且随着水流量的增加而略有增加。在这些结果上，我们认为水或煤石相的大容量可能会影响多孔壁内的流体运动，这促进了传质率。因此，我们计划阐明所用的多孔材料的影响，其孔径和壁厚对质量转移速率的影响。