聚苯醚/聚砜复合膜对乙醇/水混合体系的渗透汽化分离

Pervaporation Separation of Ethanol/Water Mixture by PPO/PSF Composite Membrane

以聚砜超滤膜为基膜,采用溶剂蒸发法制备聚苯醚/聚砜复合膜.用红外光谱(FT-IR)表征复合膜的制备效果,通过扫描电镜(SEM)观察其断面形貌;研究了聚苯醚(PPO)含量、进料液乙醇含量及进料液温度对复合膜渗透汽化分离性能的影响.结果表明,随铸膜液中PPO质量分数的增大,复合膜的分离因子增大,渗透通量减小;随进料液中乙醇质量分数的增大,复合膜的分离因子减小,而渗透通量增大;随进料液温度的升高,复合膜的分离因子及渗透通量均增大.对铸膜液中PPO质量分数为14%的复合膜,在进料液乙醇含量10%、进料液温度60℃时,膜的渗透通量157.2 g/(m2.h),膜对乙醇的选择系数为15.6.

PPO/PSF composite membrane was prepared by solvent evaporation method,and by taking polysulfone ultrafiltration membrane as the basement membrane.The preparation effect of the composite membrane was investigated by FT-IR and its section morphology was observed by scanning electron microscopy（SEM）.Effects of influence of casting solution composition,feed solution concentration and feed solution temperature on separation performance of composite membrane were also studied.The results show that with increasing of PPO concentration in the membrane solution,composite membrane separation factor increases and permeation flux decreases.With increasing of ethanol concentration in the feed solution,the composite membrane separation factor decreases,while permeation flux also increases.With increasing of feed solution temperature,both composite membrane separation factor and permeation flux increase.It is also found that the PPO/PSF composite membrane exhibits high separation performance.The total permeation flux and the separation factor for ethanol can be 157.2 g/（m2·h）and 15.6 respectively,when PPO concentration in casting solution is 14%,the feed concentration is 10% and the feed solution temperature is 60 ℃.