A diffusion model of the pervaporation separation of ethylene glycol-water mixtures through crosslinked poly(vinyl alcohol) membrane |
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| Affiliation: | 1. Natural Gas Engineering Department, School of Chemical and Petroleum Engineering, Shiraz University, Molla Sadra Street, Shiraz, 71348-51154, Iran;2. Center for Hydrate Research, Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, CO, 80401, United States;1. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA;2. Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA;3. Institute for Networked Autonomous Systems, University of Florida, Gainesville, FL, USA |
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| Abstract: | The pervaporation separation of ethylene glycol-water mixtures was carried out over the full range of compositions at temperatures varying from 60 to 80°C, using chemically crosslinked PVA dense membrane which had been developed in our laboratory. A new thermodynamic diffusion coefficient equation is derived based on the modified Vigne equation. Combining Lee-Thodos equations, Wilke-Chang equations, Vrentas-Duda's free volume theory, diffusion equations and swelling equilibrium equations, the permeation fluxes of individual components in ethylene glycol-water mixture through crosslinked poly(vinyl alcohol) (PVA) dense membrane have been calculated and showed to be in agreement with the experimental values. |
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