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采用热浸渍涂晶加旋转晶化方法在α-Al_2O_3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2g/L、二次晶化时间为28h时,制备出的ZSM-5沸石膜交互生长良好,膜层致密。对比3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348K时对90%异丙醇进行渗透汽化脱水,渗透通量可达到1.68 kg/(m~2·h),分离因子为17 991。
ZSM-5 zeolite membrane was synthesized on α-Al 2 O 3 micro-porous support by hot dip coating and spin-crystallization method, and applied to the isopropanol / water system for pervaporation dehydration. The phase composition and microstructure of ZSM-5 zeolite membrane were characterized. The effects of synthesis time, seed concentration and preparation method on the properties of ZSM-5 zeolite membrane were studied. The results show that the ZSM-5 zeolite membrane grows well and the membrane layer is dense when the first coating concentration is 2g / L and the secondary crystallization time is 28h. Comparing the three synthetic methods (dip-coating plus spin-crystallization, hot-dip coating plus spin-crystallization, hot-dip coating plus static crystallization) ZSM-5 zeolite membrane pervaporation 90% isopropanol Dehydration performance. The results show that hot dip coating and spin-crystallization are more suitable for the preparation of hydrophilic ZSM-5 zeolite membrane. The zeolite membranes prepared by permeation of 90% isopropanol at 348K have a permeation flux of 1.68 kg / (m ~ 2 · h), the separation factor is 17991.