The effect of acid (H2SO4) treatment on pervaporation property is studied using the membrane with
blend ratio of 50/50 (w/w, chitosan/N-methylol nylon 6). Fig. 1 shows a similar trend in total and water permeability. The major difference is that the ethanol permeability has been reduced signi®cantly,especially at higher ethanol concentration. The ionically crosslinked membrane structure effectively excludes the permeation of ethanol,