Abstract
A titanium-substituted silicalite (TS-1) membrane with high pervaporation separation performance has been synthesized onto 10-cm-long mullite tube by in-situ crystallization using tetraethyl orthosilicate, titanium tetrabutoxide and tetrapropylammonium hydroxide, respectively, from the sol with a composition of SiO2: 0.02 TiO2: 0.17 TPAOH: 120 H2O for the hydrothermal treatment time of 20 h at 200°C. The membrane and the accompanied powders were characterized by XRD, FT-IR and UV spectroscopy, SEM and ICP analysis. The separation performance was evaluated by pervaporation test. For a feed concentration of 5 wt% ethanol/water mixtures at 60°C, the separation factor for ethanol over water and total flux were 127 and 0.77 kg/m2.h, respectively.
