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membrane. This discrepancy is probably due to the ratio of the water molecules to the sulfonic acid sites, λ, being significantly reduced through the thickness of the membrane by the vacuum on the shell-side effectively drying it out and shutting down water transport. Relative humidities in the shell for the experiments reported here range from 1.1% to 5.4%. These are below the values of 6.5% to 94% mentioned earlier that were used by Ye and LeVan9 to establish their diffusion coefficient. 5.5 Conclusions An experimental and modeling study has been performed to examine the via- bility of using a multi-tube Nafion⃝R shell and tube membrane module with vacuum applied on the shell side in lieu of a purge gas to dehydrate a gas stream flowing on the tube side. In experiments, the membrane remained intact and showed no degrada- tion in integrity over the course of the study. A mathematical model was developed and solved that accounted for an interfacial resistance and a diffusional resistance through the membrane. Several cases were investigated in which the feed flow rate and relative humidity varied from 5 to 10 slpm and 20% to 70%, respectively. We conclude that a Nafion⃝R membrane module with a shell-side vacuum can be used for removal of water from a feed stream. We also determined that although water was being transported from the tube to the shell side, the flux of water through the membrane was lower than predicted by the relationship previously developed by Ye and LeVan9 due to decreased hydration levels inside the membrane. We also determined that mass transfer resistances inside the fluid phase have no significant impact on the rate of water transport. 99PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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