화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.38, No.10, 2150-2156, October, 2021
DOI10.1007/s11814-021-0839-8  Export Citation
Preparation of heteroatom isomorphously substituted MEL zeolite membranes for pervaporation separation of dimethylformamide/water mixturesPreparation of heteroatom isomorphously substituted MEL zeolite membranes for pervaporation separation of dimethylformamide/water mixtures
Qigang Wu, Rong Xu1, Hui Shao1, Jing Zhong1, †, Xiuxiu Ren1, and Zhengzhong Zhou
  • National & Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban & Rural Mining, Changzhou University, Changzhou 213164, China
  • 1Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
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The recovery of dimethylformamide (DMF) by pervaporation is less energy intensive and more economical than the traditional distillation method. High/pure silica zeolite is a typical organics perm-selective material for pervaporation membrane due to its hydrophobic nature, demonstrating great potential for recovering organic components from aqueous solutions. In this study, as an attempt to further enhance the membrane hydrophobicity, titanium and zirconium-substituted MEL type zeolite membranes (Ti-silicalite-2 and Zr-silicalite-2) were synthesized on the α-Al2O3 discs by a secondary growth method. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) results confirmed the isomorphous substitution of the MEL framework by Ti and Zr atoms. The effects of isomorphous substitution, feed temperature and concentration on the DMF recovery performance were investigated via systematically designed pervaporation experiments. The fluxes and separation factors both increased with the isomorphous substitution of heteroatom, as well as increasing feed temperature and decreasing feed concentration. The Ti-silicalite-2 membrane exhibited a high separation factor of 6.4 with a total flux of 0.98 kg·m-2·h-1 for a 5wt% DMF/water feed at 343K.
Keywords:MEL Zeolite Membrane;Pervaporation;Hydrophobic;Isomorphous Substitution;Dimethylformamide/Water Mixtures
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