Abstract
PHI zeolite membrane was prepared by the secondary growth method on the surface of a porousα-Al_2O_3 disk support.The effects of the zeolite seed preparation method,secondary growth time, and temperature on membrane synthesis were investigated.The as-synthesized PHI zeolite membranes were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM).The XRD results show that PHI zeolite emerges on the support.The SEM results show that the support surface is fully covered by uniform and compact PHI zeolite membrane synthesized by the secondary growth method and the thicknesses of the membrane layer was found to be about 20μm.The as-synthesized PHI zeolite membranes were used for dehydration of methanol(MeOH),ethanol(EtOH),isopropanol(IPA),and tert-butanol(TBA) solutions with different kinetic diameters.The influence of feed concentration on the separation performance was investigated by pervaporation tests.The results show that the PHI membranes exhibited excellent performance of the dehydration of alcohol/water mixtures.It was found that the flux and the separation factors of isopropanol and tert-butanol increased with the increment of the water amount in the feed and the separation factors of methanol and ethanol decreased slightly.
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