采用两步晶种法在大孔α-Al_2O_3载体上合成NaA沸石膜  

Preparation of NaA Zeolite Membrane on Macroporous α-Al_2O_3 Support by Two-Step-Seeding Method

作　　者：盛春光[1] 杨建华[1] 殷德宏[1] 鲁金明[1] 陈赞[1] 王金渠[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,辽宁大连116024

出　　处：《石油化工》2011年第8期820-824,共5页Petrochemical Technology

基　　金：中央高校大连理工大学重大项目培育基金项目(851003)

摘　　要：采用热浸渍-擦涂法在大孔α-A1203载体管外表面涂覆粒径为2μm的大晶种，从而起到初步修饰载体孔道的作用；然后采用提拉法在大晶种修饰后的载体管表面涂覆粒径为400nm的小品种，最终使载体管的表面形成薄而连续的品种层；最后利用旋转烘箱对预制晶种层的载体管进行一次动态水热晶化合成，制得NaA沸石膜。采用SEM和XRD等方法制备的NaA沸石膜进行了表征，并对其渗透汽化性能进行了测试。实验结果表明，制备的NaA沸石膜连续、致密且重复性高；在温度为353K、真夺度为200～300Pa的条件下，对乙醇质量分数90％的水／L醇体系进行分离．分离系数大于10000，渗诱诵量可扶1．8k2／（m^2·h）以上。NaA zeolite membranes were prepared by modification of macroporous α-Al2O3suppOrt, which included dip-coating with 2 μm size seed crystals, wiping for seeding smaller crystals with the size of about 400 nm to form a continuous and homogeneous seed layer on the support surface, and dynamically hydrothermally synthesizing the membranes on the seeded support surface in a rotating oven. The prepared NaA zeolite membranes were characterized by means of SEM and XRD. The results indicated that the prepared membranes were continuous and dense, and could be prepared repeatedly. Pervaporation experiments were carried out under 353 K and 200 -300 Pa in a water/ethanol system with 90% （w） ethanol concentration to test performance of the synthesized membranes. The result showed that the water flux reached 1.8 kg/（m^2·h） and the separation factor was more than 10 000.

关 键 词：NAA沸石膜 热浸渍-擦涂法 大孔α-Al2O3载体 渗透汽化 

分 类 号：TQ051.8[化学工程]