Modeling of Pevaporation process for water-alcohol separation with polymer membrane was performed using COMSOL Multiphysics software. Modeling was performed for two parts of the membrane and feed channel. For the feed section of the semiconductor, there is a mass transfer and semiconductor transfer term, while only the mass transfer occurs in the membrane. The flux from the membrane was calculated for the various concentrations and temperatures of the feed by the software. The concentration profiles in the membrane and the profile of speed and concentration in the feed channel were calculated for different operating conditions. The results showed that the modeling error to predict the flow of flask from the membrane for various feed concentrations (1.5-2.1%) was acceptable. For feed at different temperatures, the calculated error values are between (2.7-5.5) percent. Also, the speed and concentration profiles in the input channel of the feed and inside the membrane are calculated for the velocity and concentration of different feed intakes and along the channel by the software and the results are presented according to the results obtained, it can be concluded that the modeling of the evapotranspiration process using COMSOL Multiphysics software can help predict the results and determine the design parameters of the process.