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Development of High-Functioned Fixed Carrier Membrane by Control of Membrane Morphology

通过膜形态控制开发高功能固定载体膜

基本信息

批准号：
08650912
负责人：
KITAMURA Yoshiro
金额：
$ 1.34万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650912/
关键词：
Fixed carrier membrane Ionomer membrane Facilitated transport Separation membrane

项目摘要

The facilitated transport of ethyl ester of docosahexaenoic acid (DHA-Et) was studied through the thin solution-cast perfluorosulfonated ionomer membranes. The carrier of DHA-Et was Ag^+ and was immobilized in the support ionomer membrane by electrostatic force. In this system, the feed phase, membrane phase and receiving phase had the same solvent. This system was already proved to be highly stable in our previous work. When ethanol with 15vol% water was used as the solvent, the DHA-Et permeance in the cast membrane, which is defined as the flux divided by the solute concentrations the feed phase, was about 4 times higher thatn that in the commercial Nafion^<<encircledR>> 117 membrane due to thinner membrane thickness. In the case of acetone solvent, the high selectivity of DHA-Et to ethyl ester of oleic acid of 42 and the high facilitation factor of 153, which is defined as the ratio of facilitated transport rate to physical transport rate, were obtained. These membrane performances were superior to those by Nafion^<<encircledR>> 117 membrane. The effects of membrane preparation conditions such as the annealing temperature and kinds of the polar solvents added to the ionomer solution before the annealing on the membrane performances were investigated in detail. Furthermore, small angle X-ray scattering (SAXS) measurement was carried out to study the membrane structure. The experimental result suggested that the lower crystallinity in the cast membrane than in Nafion^<<encircledR>> 117 membrane.

研究了二十二碳六烯酸乙酯（DHA-Et）在全氟磺化离子膜上的转运。DHA-Et的载体为Ag^+，通过静电力将其固定在支撑离子膜上。在该系统中，进料相、膜相和接收相具有相同的溶剂。这个系统在我们之前的工作中已经被证明是高度稳定的。当以15vol%水的乙醇作为溶剂时，由于膜厚度较薄，铸膜中的DHA-Et渗透率（定义为通量除以进料相溶质浓度）约为商用Nafion^<<encircledR>> 117膜的4倍。在丙酮溶剂条件下，DHA-Et对油酸乙酯的选择性为42，易化系数为153，即易化输运率与物理输运率之比。这些膜的性能优于Nafion^<<encircledR>> 117膜。研究了薄膜制备条件（退火温度和退火前加入的极性溶剂种类）对薄膜性能的影响。此外，采用小角x射线散射（SAXS）测量对膜的结构进行了研究。实验结果表明，铸膜的结晶度低于Nafion^<<环合dr >> 117膜。