液-液置换法测试超滤膜孔径及其分布的研究

Study on determining pore size and pore size distribution of ultrafilratim mermbrane by liquid-liquid disqlacement method

利用液-液置换法测定了醋酸纤维CA超滤膜及聚丙烯腈PAN超滤膜的孔径及孔径分布。研究了测试流程、浸润-渗透体系对测定结果的影响及其测定的重复性等。结果表明,该方法可用于测定超滤膜的孔径及孔径分布,并且具有操作简便、测试压力接近膜工作压力等优点。

The pore size and the pore size distribution of CA and PAN UF membrane were determined by liquid-liquid displacement method. The influence of determining process and wetting liquid and displacing liquid on the determined results were investigated. Two tests were run by using the same membrane and system. The results show that liquid-liquid displacement could determine the pore size and pore size distribution of UF membrane. This method is easy to use and its pressure is relatively low (near the operation pressure).