膜的污染和劣化始终是制约膜技术发展的瓶颈之一.在液体分离膜过程中,浓差极化是产生膜污染的主要原因,因此减小浓差极化即可减轻膜污染.本文首先介绍了浓差极化现象和模型以及传质系数的求算,并且提出一种简单的实验方法测定膜过程的浓差极化程度,然后针对不同分子量的溶质体系对影响浓差极化程度的操作条件进行定量分析,包括操作压力和原料液循环流量,最后对如何减轻液体分离膜过程由浓差极化导致的膜污染给出几点建议.
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