含氟体系中MFI型分子筛膜的制备及其乙醇/水分离性能  

Preparation of MFI zeolite membranes in fluoride media and separation performance for ethanol/water mixture

作　　者：孔晴晴 张春[1] 王学瑞[1] 顾学红[1] 

机构地区：[1]南京工业大学化学化工学院,材料化学工程国家重点实验室,江苏南京210009

出　　处：《化工学报》2014年第12期5061-5066,共6页CIESC Journal

基　　金：国家自然科学基金项目(21222602,21176117);江苏省杰出青年基金项目(BK20122040);江苏省自然科学基金青年基金项目(BK20130915);中国博士后基金面上项目(2012M521065);江苏高校优势学科建设工程项目~~

摘　　要：以氟化铵为矿化剂、四丙基溴化铵为模板剂,在负载晶种的钇稳定氧化锆(YSZ)中空纤维支撑体表面合成了MFI型分子筛膜,并用于乙醇/水的分离;系统考察了氟硅比(nNH4F/nSi O2)、合成时间等条件对膜分离性能的影响,在nNH4F/nSi O2为0.8、合成时间为8 h下合成出高性能膜,其通量达8.2 kg·m-2·h-1、乙醇/水分离因子为47;同时研究了MFI型分子筛膜在乙醇/水体系中的分离稳定性,揭示出该方法所合成膜表面无Si—OH,从而避免了Si—OH与乙醇反应而带来膜分离性能的下降。MFI zeolite membranes were synthesized on seeded yttria stabilized zirconia （YSZ） hollow fiber substrates by using ammonium fluoride as mineralizing agent and tetrapropylammonium bromide as template. The as-synthesized membranes were tested for separation of ethanol/water mixture. The influences of n_NH4F/n_Si02 ratio and synthesis time on separation performance were investigated. High-performance MFI zeolite membrane was synthesized at n_NH4V/n_Si02=0.8 and synthesis time of 8 h, which showed a permeation flux of 8.2 kg · m^-2 · h^-1 and ethanol/water separation factor of 47. The stability of MFI zeolite membranes in ethanol/water mixture was investigated. No Si--OH was detected on the surface of the as-synthesized MFI zeolite membranes, which could avoid decreased membrane separation performance by the reaction between Si--OH and ethanol.

关 键 词：MFI型分子筛膜 中空纤维 氟化铵 稳定性 乙醇分离 

分 类 号：TQ028.8[化学工程]