权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

本文提出的液液萃取设备是一种新型的传质设备，在多孔材料中保持液-液界面，每个液体都可以很容易地通过。在本研究中，利用金属丝网制成的多孔管进行了以下两种实验来考察该设备的特性。一是水-煤油体系的流体流动实验，考察了支撑在多孔管中的液-液界面的稳定性；二是以醋酸为溶剂的萃取实验。流体流动实验研究了几种不同网目数金属丝网管材保持界面稳定的工作范围。在实验中，水在该管道中向下流动，煤油在外环空中向上流动。工作范围受各相静压差的影响，并随着丝网目数的增加而变宽。TH…进一步的结果表明，界面张力引起的毛细压力起着重要的作用。但是，定量的解释还不能成功。在水-煤油体系中加入醋酸进行萃取实验，发现界面张力急剧下降，操作范围变窄。因此，只用一根网目数为-400的铁丝网管进行了提取实验，这是上面使用的管子中最细的一根。用总传质系数K_w与界面面积A的乘积对实验结果进行了评价。在假设界面位于多孔管的外表面(亲水)和内表面(疏水)的情况下，可预测K_WA值介于估计值之间。从估算的K_(Wa)值可以看出，多孔壁中的传质阻力受水和煤油相流速的影响较小，是控制传质阻力的因素。然而，K_Wa的实验结果却是预测值的几倍，并且随着流量的增加略有增加。根据这些结果，我们认为水或煤油相的整体流动可能会影响流体在多孔壁内的运动，从而促进传质速率。因此，我们计划阐明所使用的多孔材料、其孔径和壁厚对传质速率的影响。较少