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Li L.,Institute of Adsorption and Inorganic Membrane | Yang J.,Institute of Adsorption and Inorganic Membrane | Li J.,Institute of Adsorption and Inorganic Membrane | Wang J.,Institute of Adsorption and Inorganic Membrane | And 3 more authors.
AIChE Journal | Year: 2016

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.

Chen Z.,Institute of Adsorption and Inorganic Membrane | Yang J.,Institute of Adsorption and Inorganic Membrane | Yin D.,Institute of Adsorption and Inorganic Membrane | Li Y.,Institute of Adsorption and Inorganic Membrane | And 3 more authors.
Journal of Membrane Science | Year: 2010

A novel hydrophilic poly(1-vinylimidazole)/mordenite (PVI/MOR) grafting membrane was prepared by free-radical graft polymerization of 1-vinylimidazole (VI) onto the as-synthesized mordenite zeolite membrane. The surface property and the morphology of the membranes were analyzed by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), diffuse reflectance FT-IR spectroscopy (DRIFTS) and thermogravimetric analysis (TGA). The effects of VI concentrations in the grafting medium, separation temperature, feed concentration on selectivity and flux of the obtained membranes for pervaporation dehydration of acetic acid were examined. The PVI/MOR grafting membrane with the VI solution of 15 wt.% astonishingly exhibited the ideal selectivity with water contents in permeates reaching 100.00 wt.% over acetic acid feed concentrations from 71 to 94 wt.% at 80 °C. Both the total fluxes and selectivity for this membrane increased with temperature ranging from 40 to 80 °C. It was suggested that an in situ formed complex between the poly(1-vinylimidazole) (PVI) moiety of the membrane and the acetic acid in the feed played an important role in the separation performance. It not only blocked the permeation of acetic acid through the grain boundary defects but also facilitated the transport of the water molecules, resulting in an ideal selectivity of water over acetic acid. © 2009.

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