四通道中空纤维丝光沸石膜的制备与表征
作者:陈川,张春,江兴惠,顾学红
单位: (南京工业大学 材料化学工程国家重点实验室 化工学院,南京 210009)
关键词: 四通道中空纤维;丝光沸石分子筛膜;渗透汽化;溶剂脱水
分类号: TQ028.8
出版年,卷(期):页码: 2018,38(5):15-22

摘要:
 采用二次生长法在壁薄、装填密度大的四通道中空纤维表面制备出高性能的丝光沸石(MOR)分子筛膜。系统研究了制膜液组成、合成温度及合成时间对MOR分子筛膜质量的影响。结果表明,当K2O/SiO2比为0.08,合成温度为170 °C,合成时间16 h时,所制备的MOR分子筛膜膜质量最佳,75 °C下其对于90 wt.%乙醇/水体系的膜通量及分离因子分别为1.05 kg·m-2·h-1、3374,并进一步探讨了操作温度及料液水含量对膜性能的影响。此外,研究表明,所制备的MOR分子筛膜对于甲醇/水、异丙醇/水和乙酸/水体系也具有良好的分离效果。其中75 °C下对于90 wt.%异丙醇/水体系的膜通量及分离因子可达1.45 kg·m-2·h-1,6963,在90 wt.%的乙酸/水体系可保持长时间稳定运行,说明其良好的耐酸性。
 High performance mordenite zeolite membranes were fabricated on the four-channel hollow fiber with thin wall and high loading density by secondary growth method. Effects of synthesis solution composition, synthesis temperature and crystallization time on the quality of membranes were investigated. The results showed that high performance mordenite membrane was synthesized at 170 °C for 16 h with the ratio of K2O/SiO2 being 0.08. The permeation flux and separation factor of the membrane used for dehydration of 90 wt.% ethanol/water solution was about 1.05 kg·m-2·h-1, 3374, respectively. The effects of operating temperature and water content in the feed on mordenite membrane were also investigated. Meanwhile, the good pervaporation results of membrane were also achieved for dehydration of methanol/water, isopropanol/water and acetic acid/water system. The permeation flux and separation factor of the membrane used for dehydration of 90 wt.% isopropanol/water solution was about 1.45 kg·m-2·h-1, 6963, respectively. In addition, mordenite zeolite membrane could keep stable for dehydration of 90 wt.% acetic acid/water mixture during a long time test, which demonstrated that it had good acid resistance.

基金项目:
国家自然科学基金青年基金项目(21606126);国家863计划(2015AA03A602)。

作者简介:
作者简介:陈川(1993-),男,江苏常州,硕士生,主要研究方向为膜分离,E-mail:15396750639@163.com;顾学红,E-mail:xhgu@njtech.edu.cn.

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