Synthesis of Sn-Substituted ZSM-5/Carbon Zeolite Membrane and Application in Separation of Acetic Acid/water Mixtures by Pervaporation

Study on the synthesis and characterization of Sn-ZSM-5 zeolite was carried out. The Sn-ZSM-5 zeolites were prepared from the clear solution of Si(OCH(2)CH(3))(4)/SnCl(4)/NaOH/TPABr/H(2)O by hydrothermal method. SEM, XRD, IR and UV-Vis analysis confirm that Sn atoms are introduced into ZSM-5 zeolite framework. After gained Sn-ZSM-5 zeolites, the carbon tube-supported Sn-ZSM-5 membrane with various Si/Sn ratios are also synthesized by using simple seeded method. The formed Sn-ZSM-5 membranes are found dense and continuous. For 5wt% acetic acid feed, the membrane with Si/Sn of 25 has a total flux of 1.18kg.m(-2).h(-1) at 90 degrees C with an acetic acid/water separation selectivity of 4.1.