High performance ZSM‐5 membranes on coarse macroporous α‐Al2O3 supports for dehydration of alcohols |
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| Authors: | Liangqing Li Jianhua Yang Jiajia Li Jinqu Wang Jinming Lu Dehong Yin Yan Zhang |
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| Affiliation: | State Key Laboratory of Fine Chemicals, Institute of Adsorption and Inorganic Membrane, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, China |
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| Abstract: | High‐performance ZSM‐5 membranes with a low Si/Al ratio of 10.3 were prepared on cheap coarse macroporous α‐Al2O3 tubes by fluoride route without organic template. The effects of crystallization time and aluminum source on the growth, morphology and pervaporation (PV) performances of the as‐synthesized membranes were investigated. The feasibility of preparing ZSM‐5 membranes with different Si/Al ratio which was implemented by using different Al2(SO4)3·18H2O content in synthesis gel were discussed. It was found that the aluminum source had significant effect on the synthesis of membranes. The ZSM‐5 membranes prepared by using Al2(SO4)3·18H2O as an aluminum source from synthetic gel with composition of 1SiO2/0.05Al2O3/0.17Na2O/0.9NaF/45H2O showed high reproducibility and high PV performance with flux of 3.85 kg/(m2·h) and separation factor of higher than 10,000 in dehydration of 90 wt % i‐PrOH/H2O at 348 K. Moreover, the ZSM‐5 membranes exhibited high water perm‐selectivity performance for dehydration of 90 wt % n‐PrOH/H2O, n‐BtOH/H2O, and i‐BtOH/H2O mixtures, respectively. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2813–2824, 2016 |
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| Keywords: | ZSM‐5 membrane dehydration of alcohols cheap coarse macroporus support pervaporation performance |
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