By distillation at normal pressure, azeotropic mixture of ethanol and water is produced.This mixture

By distillation at normal pressure, azeotropic mixture of ethanol and water is produced.This mixture is then separated by pervaporation using a PVA based membrane(polyvinylalcohol). The temperature in the PV module is 90°C and no additional heat isadded. Retentate with water content 0.3wt.% is required. For water content in retentatebelow 10 wt.%, the flux of permeate is a linear function of the retentate water content andcan be given as JP = 11.08 xW. Composition of permeate as a function of retentatecomposition was determined experimentally and is given in following table.xW 0 0.0025 0.005 0.0075 0.010 0.015 0.020yW 0 0.532 0.742 0.800 0.835 0.884 0.914xW 0.03 0.04 0.05 0.06 0.07 0.08 0.09yW 0.947 0.960 0.962 0.965 0.968 0.973 0.974