The pervaporation separation of water-ethylene glycol mixtures was carried out over the full range of compositions at temperatures varying from 60℃ to 80℃

using chemically crosslinked PVA membrane developed in our laboratory.A new version of the diffusion of small molecules in polymeric solids was proposed and the thermodynamic diffusion coefficient equations were derived on the basis of the modified Vigne equations.That version was combined with Lee-Thodos equations

Wilke-Chang equations

Vrentas-Dudas free volume theory，diffusion equations and swelling equilibrium equations

to calculate permeation fluxes of individual components in water-ethylene glycol mixture through crosslinked PVA membrane

which were in good agreement with the experimental values．