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热浸渍涂晶加旋转晶化制备亲水性ZSM-5沸石膜及其性能表征
作者:尧鹏魁1  2 周志辉1  2 吴红丹1  2 张青鹏1  2 徐嘉晨1  2 
单位:1. 武汉科技大学资源与环境工程学院 武汉 430081 2. 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 武汉 430081 
关键词:ZSM-5沸石膜 旋转晶化 晶体生长 渗透汽化性能 
分类号:TU502.4
出版年,卷(期):页码:2017,45(1):0-0
DOI:10.14062/j.issn.0454-5648.2017.01.10
摘要:

采用热浸渍涂晶加旋转晶化方法在-Al2O3微孔支撑体上合成了ZSM-5沸石膜,并将其应用于异丙醇/水体系渗透汽化脱水。对ZSM-5沸石膜的物相组成和显微结构进行表征,研究了合成时间、晶种浓度、制备方法对ZSM-5沸石膜性能的影响。结果表明:当第一次涂晶浓度为2 g/L、二次晶化时间为28 h时,制备出的ZSM-5沸石膜交互生长良好,膜层致密。对比三种合成方法(浸渍涂晶加旋转晶化法,热浸渍涂晶加旋转晶化法,热浸渍涂晶加静态晶化法)制备的ZSM-5沸石膜对90 %异丙醇渗透汽化脱水性能。结果表明:热浸渍涂晶加旋转晶化法更适合制备亲水性ZSM-5沸石膜,制备出的沸石膜在348 K时对90%异丙醇进行渗透汽化脱水,渗透通量可达到1.68 kg/(m2·h),分离因子为17 991。
 

Zeolite ZSM-5 membranes were synthesized on macro-porous supports with hot dip-coating seed by a rotated crystallization method. The membranes synthesized were used for the pervaporation dehydration of isopropanol (IPA)/water mixtures. The effects of synthesis time, seed concentration and preparation methods on the pervaporation performance of the ZSM-5 zeolite membrane were investigated. The crystal structure and morphologies of ZSM-5 membranes were analyzed. The ZSM-5 membranes exhibit a well inter-grown and compact morphology when the primary seed concentration is 2 g/L at the seeding stage and the second synthesis time is 28 h. Three methods for the preparation of the ZSM-5 zeolite membrane used are cold dip-coating with rotated crystallization method, hot dip-coating with static crystallization method and hot dip-coating with rotated crystallization method. The results show that hot dip-coating with rotated crystallization method is more favorable for the preparation of the ZSM-5 zeolite membrane with a flux of 1.68 kg/(m2·h) and a separation factor of 17 991 for the dehydration of isopropanol/water (90/10 in mass) mixture by pervaporation at 348 K.

基金项目:
湖北省级教育部门基金项目(Q20121112)。
作者简介:
尧鹏魁(1990—),男,硕士
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