【摘要】 为了制备高性能的渗透汽化复合膜,采用水解处理后的PAN超滤膜作为基膜,通过静电层层吸附聚电解质PEI/PAA组装渗透汽化复合膜,研究了基膜水解条件对复合膜渗透汽化性能的影响,确定适宜的水解条件为温度65℃,碱液浓度为2mol/L,时间为60min;并且对制膜过程进行优化,采用未质子化的水解后基膜,选用乙醇作为PEI溶剂;同时,考察了渗透汽化过程中,操作条件以及不同醇/水分离体系对复合膜分离性能的影响.结果表明,醇类物质分子量越高,复合膜渗透汽化性能越好.当进料液为70℃的质量分数为95%的异丁醇/水溶液时,透过液中水的质量分数可达98.26%,渗透通量为346g/(m~2·h).更多还原

【Abstract】 In order to assemble the high performance pervaporation complex membrane,in this paper,the pervaporation complex membranes were assembled by electrostatic layer-by-layer absorption of PEI/PAA poly- electrolyte on hydrolyzed PAN ultrafiltration support membranes.The effects of hydrolysis conditions of sup- port membranes on pervaporation performances of complex membranes were investigated.The appropriate conditions for hydrolysis were when time is 60 mins,NaOH concentration is 2 mol/L and temperature is 65℃.In addition,the assembly process of polyelectrolyte membranes was optimized.The unprotoned hydrolysis PAN membranes were selected as the support membranes while ethanol was used as solvent of PEI, respectively.Meanwhile,the effects of operation conditions on the pervaporation separation of different alco- hol/water mixtures were subsequently researched.It was found that the larger molecular weight of alcohol, the better the performance of pervaporation of complex membranes is.In the case of pervaporation of 95% t- butanol/water mixtures,under the temperature of 70℃,the water quality ratio in the permeate and the per- meate flux of the polyelectrolyte complex membranes were about 98.26 % and 346 g/(m~2·h),respectively.更多还原