The theoretical models for pervaporation are developing. The previous models like equilibrium solution diffusion, pore flow and virtual phase change model cannot describe the mass transfer process of pervaporation precisely. In this research, the physical process of solution and desorption was treated as the pseudo chemical reaction process on the surface based on the hypothesis of nonequilibrium solution at the interface of the feed liquid and membrane. Ignoring the concentration polarization near the membrane surface and diffusion coefficient changing with concentration, the semi-experimental model was achieved. Equilibrium partition coefficient was estimated by UNIFAC model. Through the linear fitting of flux with different thickness of the membrane, diffusion coefficient was achieved, which could be applied for prediction of separation performance and chosen of operation conditions.

Application of pseudo surface reaction nonequilibrium solution-diffusion model in pervaporation mass transfer analysis

251st National Meeting (2016)

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