膜科学与技术

中空纤维MFI/?-Al2O3分子筛膜的制备及其二甲苯分离研究

作者：孙峰，张春，洪周，顾学红

单位：南京工业大学化学化工学院材料化学工程国家重点实验室

关键词： MFI分子筛膜; 中空纤维; 原位水热合成; 二甲苯分离

出版年,卷(期):页码： 2014,34(2):11-17

摘要：

采用原位水热合成法在具有较高装填面积的α-Al2O3中空纤维支撑体上制备了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5 h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/MX(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渗透性为3.7×10-9 mol/(m2?s?Pa).

MFI zeolite membranes were prepared on α-Al2O3 hollow fiber supports with high packed density by in-situ hydrothermal synthesis method. The influences of hydrothermal synthesis time and repetition times on the quality of the as-synthesized membranes were studied. It was observed that hollow fiber MFI zeolite membranes with excellent structure and para-xylene (PX) permselectivity were fabricated by twice growth for 5 h. Meanwhile, the effects of operating temperature and feed partial pressure on membrane performance were investigated systematically. As a result, the PX/OX and PX/MX separation factor up to 174 and 79 with PX permeance of 3.7×10-9 mol/(m2?s?Pa) was obtained at 150 ℃ for a PX/OX/MX (2:1:1) ternary mixture.

孙峰(1987-), 男, 江苏泰州人, 在读硕士, 从事膜材料制备与应用. *通讯联系人

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