采用原位水热合成法在具有较高装填面积的α-A12O3中空纤维支撑体上制备MFI分子筛膜.实验研究了膜合成时间及重复次数对膜质量的影响.结果表明,经过两次5h合成的中空纤维MFI分子筛膜具有良好的膜结构和较优的对二甲苯(PX)渗透选择性.同时,系统考察了操作温度和进料分压对膜性能的影响.结果显示,对于PX/OX(邻二甲苯)/MX(间二甲苯)(2∶1∶1)三元体系的分离,150℃时,PX/OX和PX/MX的分离因子分别可达174、79,PX的渗透性为3.7×10-9mol/(m2·s·Pa).
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