AROMA COMPOUND RECOVERY WITH PERVAPORATION - THE EFFECT OF HIGH ETHANOL CONCENTRATIONS

A series of pervaporation experiments was performed on (1) ethanol-wat er solutions, (2) ethanol-water solutions containing aroma compounds w ith varying ethanol concentration and (3) ethanol-water solutions cont aining varying concentrations of aroma compounds. The aroma model used consisted of five typical aroma compounds at a total concentration of 96 ppm and the membrane used was a commercial poly(dimethylsiloxane) composite membrane. The results show that the fluxes of ethanol and wa ter have a linear relationship to their concentrations in the feed. Fu rthermore, the fluxes of the aroma compounds have a simple linear rela tionship to their concentrations in the feed at a given ethanol concen tration. However, in some cases the fluxes of the aroma compounds migh t be affected by the ethanol concentration in the feed whereas the aro ma compounds do not affect the fluxes of ethanol and water.