Permeabilities and fluxes of many organic solutions were tested under continuous reverse osmosis system at pressure of 100 atm using cellulose acetate membranes shrunk at 60 ℃（CA-I）, 90 ℃(CA-II) and PVA membrane crosslinked with formalin.
CA-I, CA-II and PVC membranes were characterized by rejections of 16 %, 96 % and 14 % and water fluxes of 1,700 l, 210 l and 290 l/㎡·day respectively against 1 % NaCl testing Solution.
Alcohols showed lower rejection than other solutes due to the similarity of their chemical properties to water （CA-I, 4 %; CA-II, 12 %; PVC, 0 %）. In the order of methanol, ethanol and i-chropanol, gradual rise in rejection and decrease in flux with molecular weight were observed. Various sugars and amino acids were rejected similarly to NaCl even though slight differences in rejections and fluxes were considered to be attributed to the interacion of solute molecules with membranes and solvent. Among all, surfactant Tween-80 showed peculiar behavior that even in CA-I rejections were 96 % and fluxes were 540 l/㎡day. in this case CA-I membrane behaved like CA-II perhaps due to the formation of dynamic membrane on the surface. The rejections and fluxes by PVA membrane were lower than those by cellulose acetate membranes.