EtOH/H2O and Me2CHOH/H2O mixts. (alc. content 3-35% by mass) were sepd. at 40-75 degrees C by pervaporation through a hydrophobic membrane under lab. scale conditions. Recirculation flow rate was kept const. at 450 L/h. Av. permeation total flux, selectivity and enrichment factor were calcd. Selectivity of the sepn. and enrichment factor decreased with increasing alc. concn.