The modification of Silicotungstic acid (STA) was done by Melamine and Mixed matrix membranes from the Melamine modified Silico tungstic acid (M-STA) particles were prepared for the pervaporation dehydration of Water -Isopropanol (IPA) mixture. The characterization of the membranes were done by FTIR, SEM, EDS AFM XRD, and contact angle measurements. The M-STA loaded composite membranes showed improved pervaporation performance in comparison to the virgin membrane. The 8 wt% M-STA loaded (M8-MSTA) membrane gave an optimum pervaporation performance having flux = 0.36 kg/m2h, separation factor 485.6 for 20 wt% water -isopropanol feed composition at 60 0C was observed.

The hollow fiber composite membrane used in pervaporation test was prepared by dip coating method on the Polyether Sulfone hollow fiber using tartaric acid added PVA solution. And each membrane solution contains H2SO4 as acid catalyst for esterification reaction between PVA and TA. Also, to increase coating uniformity, specific amount of SDS(sodium dodecyl sulfate) was contained. Prepared membrane was characterized by IR spectroscopy, swelling to observe cross-linking degree of PVA and Tartaric acid then, finally used in pervaporation test. The pervaporation test was mainly studied about effect of catalyst amount in the membrane solution and the test was performed until pervaporation value converged.

Blended membranes of hydrophilic polymers poly (vinyl alcohol) (PVA) and poly(vinyl amine) (PVAm) were prepared and crosslinked with glutaraldehyde. The characterization of membranes were done by using FTIR, XRD, DSC, SEM and swelling study. MB1.5 membrane was the best one in all since it exhibited higher separation index. By using blend membrane (MB1.5), the flux through a 65-mm film increased from 0.01 to 0.47 kg/m2h at an acetonitrile/water feed ratio between 20/80 and 5/95 w/w at 30°C while separation factor increased from the 5055 to 100.84 attributed to the higher hydrophilicity of blend membranes. On comparison of pervaporation data with water-acetonitrile vapor-liquid equilibrium data it was observed that the membrane acted as third phase to effectively break the azeotropes.