Ftir Study Of The Pervaporation Performance Of Self-Assembled St-Pic Membrances

Starch-grafting-Sodium polyacrylate(St-g-PSA) and starch-grafting-polyvinyl ammonium (St-g-PVAM) self-assembled into Starch based polyion complex (St-PIC). The pervaporation behavior of water in ethanol was observed with 2DFTIR. The results showed that two state water, free water and associating water, was formed during permeation by Coulomb force with polyion group in membranes. Free water first associated with polyion group in membranes following increase of water in ethanol, than associating water was formed in membranes. The result also showed that two state water, free water and associating water, during pervaporation in membranes at 2DFTIR, free water early was changed then associating water and free water first was desorbed with increase of temperature and was separated with ethanol. A simple and convenient method was set up for studying the dehydration process of ethanol by using St-PIC membranes. The biodegradable St-PIC composite membranes were prepared and applied in the dehydration process of 95wt%, ethanol at 75 degrees C. The permeation flux of 600 similar to 1400g(-1)m(2) x h and separation factor of 900 similar to 2000.