两步法制备高性能T型分子筛膜

发布时间：2018-04-23 16:03

  本文选题：两步法 + T型分子筛膜　； 参考：《石油化工》2017年11期

【摘要】：采用两步法在n(SiO_2)∶n(Al_2O_3)∶n(Na_2O)∶n(K_2O)∶n(H_2O)=1∶0.055∶0.23∶0.08∶30的清液体系中合成高性能的T型分子筛膜,讨论了热浸渍涂镀晶种粒径、晶化时间以及晶化温度对膜的渗透汽化分离性能的影响,考查了两步法的稳定性,并将一步法和两步法所得分子筛膜的分离性能进行对比。采用SEM和XRD方法对膜的形态结构进行表征。表征结果显示,先后浸涂粒径为1.5μm和0.5μm的晶种能够在载体管上形成连续致密的晶种层。实验结果表明,在150℃下晶化4 h后,120℃下再晶化8 h可成功制备T型分子筛膜;75℃下渗透汽化分离m(异丙醇)∶m(水)=90∶10体系,渗透汽化通量和分离因子可分别达到2.043 kg/(m~2·h)和2 874,优于一步法晶化所合成的分子筛膜。
[Abstract]:The high performance T molecular sieve membrane was synthesized by two steps method in the solution system of n(SiO_2):n(Al_2O_3):n(Na_2O):n(K_2O):n(H_2O)=1:0.055:0.23:0.08:30. The particle size of hot dipping coating was discussed. The effects of crystallization time and crystallization temperature on the pervaporation separation performance of the membrane were investigated. The stability of the two-step method was investigated and the separation properties of the one-step and two-step molecular sieve membranes were compared. The morphology and structure of the membrane were characterized by SEM and XRD. The results show that the continuous dense seed layer can be formed on the carrier tube with the seeds of 1.5 渭 m and 0.5 渭 m dipping successively. The experimental results show that after crystallization at 150 鈩，

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