改性复膜对微水异丙醇的渗透汽化脱水  

Pervaporation of modified composite membrane for dehydration of micro-water isopropanol

作　　者：曾盔[1] 李继定[2] 陈翠仙[2] 

机构地区：[1]湖南农业大学应用化学系,湖南长沙410128 [2]清华大学化学工程系,北京100084

出　　处：《化学工程》2006年第5期37-40,共4页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(20276034);湖南农业大学基础科学基金资助项目(03JC06)

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α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,在72℃、1.6 kPa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=262 g/(m.h)的分离效能,显示了较好的工业应用前景。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.

关 键 词：渗透汽化 异丙醇脱水 缩甲醛 PVA/PAN复合膜 

分 类 号：TQ028.8[化学工程] TQ222.423