规模化NaA分子筛膜的制备与分离性能研究

Study on Scale-up Preparation and Separation Performance of NaA Zeolite Membranes

采用湿法球磨技术制备亚微米晶种,利用球磨亚微米晶种诱导在自制大孔α-Al_(2)O_(3)支撑体合成出高分离性能的NaA分子筛膜。采用场发射扫描式电子显微镜(FE-SEM)、渗透汽化和蒸汽渗透分离技术对所合成的膜进行了系统表征。在操作温度为348 K,对水质量分数为10%乙醇-水体系进行渗透汽化测试,分离因子>10000且渗透通量高于2.5kg·h^(-1)·m^(-2)。在此基础上利用蒸汽渗透对其进行脱水实验,在操作压力0.2 MPa,对水质量分数10%乙醇-水、异丙醇-水、四氢呋喃-水、乙腈-水四种体系进行蒸汽渗透脱水至溶液中水质量分数低于0.1%,均展示出良好的分离脱水性能。

NaA zeolite membranes were prepared by secondary growth method using ball-milled NaA particles with sub-micron size on theα-Al_(2)O_(3)support.The microstructures of preparation membranes were characterized by Field Emission Scanning Electron Microscopy(FE-SEM)and the separation performance were tested by pervaporation(PV)and vapor permeation(VP).The preparation membranes showed the permeation flux of 2.5 kg·h^(-1)·m^(-2) and water/ethanol separation factor of>10000 for separating 90∶10 ethanol-water mixture at 348 K.On this basis,the vapor permeation test which produces of solvents(EtOH,IPA,THF,ACN)at less than 0.1%of water from 90%solvent at operating pressure 0.2 MPa.