NaA分子筛膜的制备及其在吡啶脱水中的应用  

Preparation of NaA molecular sieve membrane and its application for dehydration of pyridine

作　　者：景一操 张怡 吴煜[1] 刘学军[1] JING Yi-cao;ZHANG Yi;WU Yu;LIU Xue-jun(College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

机构地区：[1]浙江工业大学化学工程学院,浙江杭州310014

出　　处：《现代化工》2018年第6期110-113,共4页Modern Chemical Industry

基　　金：浙江省海洋经济创新发展区域示范成果转化及产业化项目(2015-83)

摘　　要：通过陈化前预置载体、更新合成液改进的水热法与传统的原位水热法分别在α-Al_2O_3载体上制备NaA分子筛膜。通过XRD和SEM对2种方法合成的膜进行表征,并利用渗透汽化装置来检测其渗透蒸发性能。实验结果表明,改良的水热法优于传统水热法。改良的水热法制备的NaA分子筛膜晶体量大、覆盖率高,乙醇/水的分离因子为20.2,远远高于传统水热法合成的膜。将在α-Al_2O_3载体上制备的NaA分子筛膜应用于吡啶脱水实验,结果表明,当进料为ω(吡啶)=95%的吡啶水溶液、进料温度为96℃、处理量为1 720 mL/(h·m^2)时,可以得到ω(吡啶)=99.61%的吡啶水溶液。NaA molecular sieve membranes are prepared on the outer surface of tubular α-Al2O3 carrier by the traditional in-situ hydrothermal method and the modified in-situ hydrothermal methods separately. The modified in-situ hydrothermal method is improved through aging the carrier tube and the synthetic solution together and renewing a synthetic solution during the crystallization process. The prepared membranes are characterized by XRD and SEM,and their pervaporation performances are evaluated and compared each other via a pervaporation device.The modified in-situ hydrothermal method is verified via experiments to have higher efficiency. NaA molecular sieve membrane prepared through modified method has larger amount of crystal and higher coverage,and its separation factor for C2 H5 OH/H2 O onα-Al2O3 support is 20. 2,which is much higher than that of membrane made by the traditional in-situ hydrothermal method.The prepared NaA membranes on α-Al2O3 carrier are used to carry out dehydration test of pyridine.Results show that a pyridine solution with a purity of 99. 61 wt.% can be obtained when the concentration of feedstock pyridine solution is 95 wt. %,the feed temperature is at 96℃,and the treatment capacity is 1 720 mL·h^（-1）·m^（-2）.

关 键 词：NAA分子筛膜 原位水热法 改良的水热法 吡啶 脱水 

分 类 号：TQ028.8[化学工程]