Thermopervaporation (TEN) of ethanol-water mixture using the PDMS based composite membrane was investigated in the range of the EtOH mass fractions in feed X-EtOHf =0.003-0.057. The mean temperatures of feed and cooling liquid as well as their mean difference were 63.8, 54 and 58.5 degrees C, respectively, It was found that ethanol flux increases approximately linearly with X-EtOHj, whereas the H2O flux is almost constant. Comparing to the pervaporation process with the same type of membrane, TPV is a slower process because of a lower driving force created. To characterize quantitatively the TPV process, the multilayer in-series transport model based on solution-diffusion approach and Stefan-Maxwell equation was developed. The model calculations have shown that the highest temperature drop is in the air gap layer Permeabilities of EtOH and H2O in the PDMS membrane layer can be calculated using concentrations referring to the gas phase (or partial pressures). It was found that for EtOH such a permeability is negative, whereas for H2O is positive. The negative EtOH permeability can be explained in terms of the solution-diffusion model assuming a strong dependence of the product of partition and permeability coefficients on concentration. The obtained dependence can also indicate strong couplings between EtOH and H2O in the transport through the PDMS membrane. (C) 2015 Elsevier B.V. All rights reserved