催化学报 ›› 2013, Vol. 34 ›› Issue (3): 542-547.DOI: 10.1016/S1872-2067(11)60478-6

• 研究论文 • 上一篇    下一篇

清液体系中T型分子筛膜的高重复性合成与渗透汽化性能

张小亮, 宋鑫, 邱灵芳, 丁民正, 胡娜, 周荣飞, 陈祥树   

  1. 江西师范大学化学化工学院, 江西省无机膜材料工程技术研究中心, 江西南昌 330022
  • 收稿日期:2012-09-05 修回日期:2012-10-12 出版日期:2013-04-02 发布日期:2013-04-03
  • 通讯作者: 陈祥树
  • 基金资助:

    国家自然科学基金(20966003,21106059);国家高技术研究发展计划(863计划,2012AA03A609);江西省科技支撑计划重点项目和自然科学基金(2010BGA01200,2010GQH0068,20122BAB203018);江西省教育厅科技项目(GJJ11377).

Synthesis and pervaporation performance of highly reproducible zeolite T membranes from clear solutions

ZHANG Xiaoliang, SONG Xin, QIU Lingfang, DING Minzheng, HU Na, ZHOU Rongfei,CHEN Xiangshu   

  1. Jiangxi Inorganic Membrane Materials Engineering Research Centre, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, Jiangxi, China
  • Received:2012-09-05 Revised:2012-10-12 Online:2013-04-02 Published:2013-04-03
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (20966003, 21106059), the National High Technology Research and Development Program of China (863 Program, 2012AA03A609), Jiangxi Provincial Department of Science and Technology (2010BGA01200, 2010GQH0068, 20122BAB203018), and Jiangxi Provincial Department of Education (GJJ11377).

摘要:

以自制微米级分子筛为晶种,在清液体系中成功合成出高性能的T型分子筛膜,考察了硅铝比、水硅比、碱度及合成温度与时间等条件对膜的生长和渗透汽化性能的影响.结果表明,在摩尔组成为1SiO2:0.015Al2O3:0.41(Na2O+K2O):30H2O的清液体系中,于423K晶化6h的条件下可较快地形成一层厚度为5μm的连续致密纯相T型分子筛膜,较大缩短了膜合成时间且提高了膜致密性.在优化条件下所合成的膜具有优良的分离性能和高重复性.348K时,在10wt%水-90wt%异丙醇混合物体系中膜的渗透通量和分离因子分别高达4.20kg/(m2·h)和7800.

关键词: T型分子筛膜, 重复性, 清液, 二次生长法, 渗透汽化

Abstract:

Zeolite T membranes with very good permeation performance were successfully synthesized on porous mullite supports by the secondary growth method with homemade microsized seeds from clear solutions. The influence of synthesis parameters such as the molar ratios of SiO2/Al2O3 and H2O/SiO2, alkalinity, synthesis temperature, and crystallization time on membrane growth and permeation performance was investigated systematically. It is found that these parameters strongly affect the zeolite T growth and pervaporation performance of the membranes. Under the optimized synthesis conditions of 1SiO2:0.015Al2O3:0.41(Na2O+K2O):30H2O, the crystallization time was shortened to 6 h at 423 K and a continuous and dense T-type zeolite layer as thin as 5 μm formed on the surface of the support. It significantly improved the membrane density and permselective properties. A permeation flux and separation factor of 4.20 kg/(m2·h) and 7800, respectively, were obtained with the as-synthesized membrane for 10 wt% water-90 wt% #em/em#-propanol mixtures at 348 K. It also exhibited a very good pervaporation performance for water/ethanol mixtures separation. This high quality zeolite T membrane could be reproducibly prepared.

Key words: Zeolite T membrane, Reproducibility, Clear solution, Secondary growth, Pervaporation