Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (12): 63-67.

• Chemistry,Chemical & Energy Engineering • Previous Articles     Next Articles

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

Yuan Wen-hui1  Luo Yi-ke1  Li Li2   

  1. 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

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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- 4and 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- 4and 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