B-ZSM-5沸石分子筛膜的制备及正/异丁烷分离性能

采用两次变温热浸渍法在大孔α-Al₂O₃多孔管状载体外表面涂覆B-ZSM-5大小晶种,以制备平整、连续且致密的B-ZSM-5晶种层,随后在晶化成膜液的稀溶液体系下,利用二次生长法在α-Al₂O₃管外表层成功制备B-ZSM-5沸石分子筛膜。实验采用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对B-ZSM-5沸石分子筛膜的形貌和结构进行了表征,同时利用气体渗透测试装置分别测试了其对H₂、N₂、CH₄、n-C₄H₁₀、i-C₄H₁₀的气体渗透速率,并探究了温度对n-C₄H₁₀/i-C₄H₁₀异构体分离的影响。研究结果表明,B-ZSM-5沸石分子筛膜对n-C₄H₁₀/i-C₄H₁₀异构体分离具有较好的分离效果,在200℃、0.125 MPa下,B-ZSM-5沸石分子筛膜对n-C₄H₁₀/i-C₄H₁₀异构体的理想分离系数达104.73,对n-C₄H₁₀和i-C₄H₁₀的气体渗透速率分别为5.98×10^-8和5.71×10^-10mol·m^-2·s^-1·Pa^-1。

Preparation of B-ZSM-5 Membrane for Butane Isomer Separation

B-ZSM-5 membrane was prepared on the outer surface of α-Al₂O₃ support from dilute solution system of crystallization film forming solution by the secondary growth method. The morphology and structure of B-ZSM-5 membrane were characterized by scaning electron microscope and X-Ray Diffratometer. At the same time, gas permeation rates of H₂, N₂, CH₄, n-C₄H₁₀ and i-C₄H₁₀ were measured by gas permeation apparatus, respectively. The effect of temperature on the separation of n-C₄H₁₀/i-C₄H₁₀ isomers was investigated. The results showed that the as-prepared B-ZSM-5 membrane exhibited good separation performance for n-C₄H₁₀/i-C₄H₁₀ isomers. The gas permeation rates of n-C₄H₁₀ and i-C₄H₁₀ were 5.98×10^-8 and 5.71×10^(-10 )mol·m^-2·s^-1·Pa^-1, respectively. The corresponding ideal separation coefficient is up to 104.73.