含氟体系下亲水性ZSM-5沸石分子筛膜的制备及其性能

Preparation and Characterization of Water Perm-selectivity ZSM-5 Zeolite Membrane Using Fluoride Route

用变温热浸渍法在廉价大孔α-Al2O3的载体管上涂覆大小晶种引入平整均匀的晶种层,随后在无有机模板剂的含氟体系下通过二次水热生长法制备了亲水性ZSM-5沸石分子筛膜。实验考察了小晶种液浓度对形成晶种层及ZSM-5沸石分子筛膜形貌和性能的影响。并将制备的ZSM-5沸石分子筛膜分别用于渗透汽化异丙醇脱水和乙酸脱水体系中。结果显示,小晶种液浓度为0.2wt%时,制备的ZSM-5沸石分子筛膜在75℃下对10wt%水/异丙醇和10wt%水/乙酸混合物体系均具有优良的分离性能,其渗透通量分别为3.64 kg/(m2·h)和0.61 kg/(m2·h),分离因子分别达3204和1321。

Water perm-selectivity ZSM-5 zeolite membranes were prepared from fluoride media without organic template on the low cost macroporous α-Al2O3 tubular support by secondary growth. A varying temperature hot dip-coating method with different size of crystal was used to form a flat and continuous perfect seed layer. The effects of concentration of the small seed solution on the surface of seed layer, the morphology and pervaporation property of the ZSM-5 membrane were investigated. The results show that when the concentration of the small seed solution is 0.2wt%, the prepared ZSM-5 zeolite membrane displays high water perm-selectivity properties in the pervaporation dehydration of 10wt% H2O/IPA and 10wt% H2O/Ac OH mixtures at 75℃, which fluxes are 3.64 kg/（m2·h） and 0.61 kg/（m2·h）, separation factor up to 3204 and 1321, respectively.