亲水性沸石膜在异丙醇脱水中的应用及其耐酸性研究
作者:金鸽1,周志辉1,刘红1,吴建雄1,郭大鹏1,王金渠2
单位: 1. 武汉科技大学 冶金矿产资源高效利用与造块湖北省重点实验室,湖北,武汉 430081;
关键词: 亲水性沸石膜;渗透汽化;耐酸性;异丙醇脱水
分类号: TQ028.8
出版年,卷(期):页码: 2014,34(6):77-83

摘要:
本文采用二次生长法,在ɑ-Al2O3陶瓷管上制备亲水性NaA、T型、ZSM-5沸石膜,采用SEM对其进行表征。比较三种亲水性膜在异丙醇/水体系的渗透汽化性能,考察其在不同的料液温度下对异丙醇的分离效果。通过优化膜合成液中Si/Al和F-/Si的摩尔比、合成时间等条件,提高ZSM-5沸石膜的渗透汽化性能。分析考察膜的耐酸性能,结果显示ZSM-5沸石膜具有良好的耐酸性;将ZSM-5沸石膜在pH为5.8的酸性溶液浸泡10 d后,用于97 wt.%的乙酸乙酯/水体系中渗透汽化脱水,渗透液水含量可达99.59 wt.%,渗透通量可达0.12 kg·m-2·h-1,分离因数高达7894。
In this paper, hydrophilic NaA, T-type and ZSM-5 zeolite membranes on α-Al2O3 tubular supports were prepared by the secondary growth method and characterized by means of SEM. The pervaporation performance of membranes was compared using isopropanol/water mixture at different feed temperatures. The pervaporation performance of ZSM-5 membranes was improved by optimizing the synthesis conditions, such as the molar ratio of Si/Al and F-/Si in the synthesis solution, the crystallization time. The acid resistance of the membranes was investigated and the results indicate that ZSM-5 zeolite membranes have good acid resistance. The ZSM-5 zeolite membrane was characterized using an 97 wt.% ethyl acetate/water system after soaking in acidic solution of pH=5.8 for 10 days; the permeate water content is 99.59 wt.%, permeate flux could reach 0.12 kg·m-2·h-1 and the separation factor could reach to 7894.

基金项目:

作者简介:
金鸽(1989—),女,湖北随州人,硕士生。

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