用于分离二甲苯异构体的MFI型分子筛膜的制备

华南理工大学学报（自然科学版） ›› 2006, Vol. 34 ›› Issue (12): 63-67.

用于分离二甲苯异构体的MFI型分子筛膜的制备

袁文辉¹罗仡科¹李莉²

1. 华南理工大学化工与能源学院, 广东广州 510640; 2. 华南理工大学环境科学与工程学院, 广东广州 510640

收稿日期:2005-12-31 出版日期:2006-12-25 发布日期:2006-12-25
通信作者: 袁文辉(1969-) ,男,博士,副教授,主要从事膜催化分离和化工吸附分离研究. E-mail:cewhyuan@scut.edu. cn
作者简介:袁文辉(1969-) ,男,博士,副教授,主要从事膜催化分离和化工吸附分离研究.
基金资助:
广东省自然科学基金资助项目(04020126) ;教育部留学基金资助项目;教育部传热与节能重点实验室访问学者基金资助项目;广东省绿色化学品重点实验室开放基金资助项目

Preparation of MFI-Type Zeolite M embrane for Pervaporation Separation of Xylene Isomers

Yuan Wen-hui¹ Luo Yi-ke¹ Li Li²

1.School of Chemical and Energy Engineering,South China Univ.of Tech.,Guangzhou 5 10640,Guangdong,China;2.Schol of Environmental Science and Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China

Received:2005-12-31 Online:2006-12-25 Published:2006-12-25
Contact: 袁文辉(1969-) ,男,博士,副教授,主要从事膜催化分离和化工吸附分离研究. E-mail:cewhyuan@scut.edu. cn
About author:袁文辉(1969-) ,男,博士,副教授,主要从事膜催化分离和化工吸附分离研究.
Supported by:
广东省自然科学基金资助项目(04020126) ;教育部留学基金资助项目;教育部传热与节能重点实验室访问学者基金资助项目;广东省绿色化学品重点实验室开放基金资助项目

摘要/Abstract

摘要： 以无模板剂二氧化硅溶胶为前驱体,用二次生长法在已浸渍分子筛种子层的α-氧化铝支撑体上制备MF I型分子筛膜,采用X射线衍射法、扫描电子显微镜和气体渗透实验表征分子筛膜的性能,研究了单组分和双组分二甲苯异构体在氧化铝支撑分子筛膜的渗透汽化分离性能. 结果表明:在50 ℃和10 h下,二甲苯异构体单组分的渗透汽化通量按对二甲苯、间二甲苯、邻二甲苯的顺序依次减小;单组分的对二甲苯/邻二甲苯和对二甲苯/间二甲苯的分离因子可分别达到67和46,双组分的分别可达到29和42;单组分的对二甲苯和邻二甲苯的通量分别为7. 41 ×10^{- 4}和0. 11 ×10^{- 4} mol/ (m² ·s) ;双组分混合物中对二甲苯和邻二甲苯的通量分别为3. 58 ×10^{- 4}和0. 086 ×10^{- 4} mol/ (m² ·s). 说明此分子筛膜适于渗透汽化分离二甲苯异构体.

关键词: 分子筛膜, 二甲苯异构体, 渗透汽化分离, 分离因子

Abstract:

MFI-type zeolite membranes were prepared on-alumina support dip-coated with seed layer by means of the secondary growth method,with silica sol without organic template as the promoter.The properties of the pre-pared zeolite membranes were then characterized by XRD,SEM and gas permeation experiments.Th e pervapora-tion separation of pure xylene isomer an d its binary mixtures through the prepared MFI·-type membranes was also in-vestigated.Th e results show that the membranes were perm eable for P-xylene isomers but not for other isomers at 5O℃ for 10 h,with a decreasing pervaporation flux order of p-xylene>m-xylene>o-xylene;(2)the separation factors of p-/o-xylene and p-/m-xylene of both single and binary mixtures reach 67 and 46,29 and 42,respectively;(3)the fhlxes ofp-xylene and o-xylene are respectively 7. 41 ×10^{- 4}and 0. 11 ×10^{- 4} mol/ (m² ·s) ;and(4)the fluxes ofp-xylene an d o-xylene of binary mixtures are respectively 3. 58 ×10^{- 4}and 0. 086 ×10^{- 4} mol/ (m² ·s).All these results indicate that the prepared MFI-type zeolite membran e is suitable for the pervaporation separation of xylene isomers.

Key words: zeolite membrane, xylene isomer, pervaporation separation, separation factor

袁文辉罗仡科李莉. 用于分离二甲苯异构体的MFI型分子筛膜的制备[J]. 华南理工大学学报（自然科学版）, 2006, 34(12): 63-67.

Yuan Wen-hui Luo Yi-ke Li Li. Preparation of MFI-Type Zeolite M embrane for Pervaporation Separation of Xylene Isomers[J]. Journal of South China University of Technology (Natural Science Edition), 2006, 34(12): 63-67.