Pervaporation is mainly used to separate liquid mixtures because it exhibits a high selectivity compared with traditional distillation processes and it is known to be an energy saying separation process. Zeolite membranes show better thermal. mechanical, chemical stability than polymer membranes and especially silicalite-1 membrane can effectively separate organic compounds from water because of its high hydrophobicity. In this study, volatile organic compounds of ketone are separated by pervaporation using silicalite-1 membrane. As a feed concentration of acetone and MEK increases, a permeation flux of acetone and MEK increases while a selectivity decreases.