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

doi:10.3969/j.issn.0438-1157.2014.12.056

CIESC Journal ›› 2014, Vol. 65 ›› Issue (12): 5061-5066.DOI: 10.3969/j.issn.0438-1157.2014.12.056

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

KONG Qingqing, ZHANG Chun, WANG Xuerui, GU Xuehong

State Key Laboratory of Materials-Oriented Chemical Engineering, School of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China

Received:2014-05-16 Revised:2014-06-30 Online:2014-12-05 Published:2014-12-05
Supported by:
supported by the National Natural Science Foundation of China (21222602, 21176117), the Outstanding Young Fund of Jiangsu Province (BK20122040), the Natural Science Foundation of Jiangsu Province (BK20130915), the General Financial Grant from the China Postdoctoral Science Foundation (2012M521065) and the Priority Academy Program Development of Jiangsu Higher Education Institutions(PAPD).

含氟体系中MFI型分子筛膜的制备及其乙醇/水分离性能

孔晴晴, 张春, 王学瑞, 顾学红

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

通讯作者: 顾学红
基金资助:
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.

Abstract

Abstract: 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_SiO₂ ratio and synthesis time on separation performance were investigated. High-performance MFI zeolite membrane was synthesized at n_NH₄F/n_SiO₂=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.

Key words: MFI zeolite membrane, hollow fiber, ammonium fluoride, stability, ethanol separation

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(n_NH₄F/n_SiO₂)、合成时间等条件对膜分离性能的影响,在n_NH₄F/n_SiO₂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.

关键词: MFI型分子筛膜, 中空纤维, 氟化铵, 稳定性, 乙醇分离

CLC Number:

TQ028.8

KONG Qingqing, ZHANG Chun, WANG Xuerui, GU Xuehong. Preparation of MFI zeolite membranes in fluoride media and separation performance for ethanol/water mixture[J]. CIESC Journal, 2014, 65(12): 5061-5066.

孔晴晴, 张春, 王学瑞, 顾学红. 含氟体系中MFI型分子筛膜的制备及其乙醇/水分离性能[J]. 化工学报, 2014, 65(12): 5061-5066.

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

含氟体系中MFI型分子筛膜的制备及其乙醇/水分离性能

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