碱金属离子改性聚乙烯醇渗透汽化膜

Alkali-Metal Ion Improved PVA Pervaporation Membrane

研究了含碱金属氯化物的聚乙烯醇。马来酸酐（ＰＶＡ－ＭＡ）交联膜对乙醇－水混合物的分高性能，盐含量低于６％质量时，膜的透量明显增加，原料液乙醇浓度较高时，分离系数也增大，含盐膜从５０％乙醇水溶液中吸附了５％～８％的自由水。

The separation of ethanol/water mixture by pervaporation by crosslinked PVA-MA membrane containing LiCl,NaCl and KCl has been investigated.The flux increasedmarkedly when salt content was less than 6 wt%in the dry membrane,and the separationfactor increased when ethanol concentration in feed solution was high.The DSC resultsshowed that the membranes adsorbed 5%～8wt%of free water from ethanol/water mixture(50/50wt/wt),which is hardly observed by weighing method.