中文摘要：

介绍了用缩甲醛改性的PVA／PAN复合膜的制备方法，并用于质量分数低于5％的微水异丙醇体系的渗透汽化（PV）深度脱水研究，考察了操作温度、料液浓度与操作压力等因素对分离性能的影响。渗透通量J与分离系数口均随温度的升高而增大，而随料液异丙醇浓度的升高J减小而α增大，72℃、1．6kPa膜后压力下，该膜对含异丙醇质量分数为98％的体系，仍有α=316，J=262g／（m·h）的分离效能，显示了较好的工业应用前景。

英文摘要：

The polyvinyl alcohol / polyacrylonitrile （PVA/PAN） composite membrane was prepared and modified with condensed formaldehyde. The membrane was used in experimental study on pervaporation for dehydration of micro-water isopropanol system （ water mass fraction lower than 5% ）. The effects of operation temperature, feed concentration and operation pressure on the dehydration properties were investigated. It shows that permeation J increases and separation factor a decreases with increasing temperature, meanwhile J decreases and α increases with increasing isopropano] mass fraction in feed. The membrane has J of 262 g/（ m · h） and α of 316 at 72 ℃ under 1.6 kPa pressure of downstream for dehydration of mass fraction 98% isopropanol system, which shows a good industrial application prospect.