采用浸涂法涂敷晶种,并通过二次生长法在α-Al2O3中空纤维外壁制备了NaA分子筛膜,考察了添加聚乙烯吡咯烷酮(PVP)中间层对成膜和膜分离性能的影响.采用扫描电镜(SEM)对膜的表面形貌进行表征,通过75℃渗透汽化分离质量分数为90％的乙醇/水溶液表征膜层的分离性能.研究发现,采用浸涂法涂敷晶种,无PVP中间层制备的膜层对乙醇/水溶液的分离因子仅为3 000左右,而添加了PVP中间层制备的膜层的分离因子可超过10 000.考察了PVP添加量对膜通量的影响.研究发现,添加了PVP中间层制备的膜(其分离因子＞10 000)的通量比无PVP中间层的膜(浸涂-滚擦法涂敷晶种,分离因子＞10 000)的通量[7.83 kg/(m2·h)]低,且随着制备中间层的PVP溶液浓度的升高,膜的通量相应降低,当PVP质量百分浓度分别为1％,3％和5％时,膜的通量分别为7.35,5.82和5.51 kg/(m2·h).
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