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  • Transport Process of Isopropanol Aqueous Solution by Pervaporation

    To study the transport process of isopropanol aqueous solution by pervaporation, the transport model of isopropanol and that of water at 323 K in polyvinyl alcohol(PVA) membrane were obtained in this paper. Theoretical predictions agreed well with the experimental results. The interactional parameter between water and PVA membrane is less than that between isopropanol and PVA membrane, which shows that water is preferentially dissolved in PVA membrane. The plasticizing coefficient and diffusion coefficient at infinite dilution of water are larger than those of isopropanol,which shows that the dissolution and permeation in PVA membrane of water are greater than those of isopropanol. Both the interactional parameter between water and isopropanol in the membrane and that in feed rise with the increase of isopropanol content in feed, which shows that the larger isopropanol content is, the higher selectivity of the membrane is and the more remarkable separation effect of pervaporation is....

    2020-11-10 09:33:08浏览:53 modelpermeatefluxisopropanolwaterpervaporation

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  • Treatment of oil/water emulsion by polyethylene glycol ultrafiltration membrane

    Polyethylene glycol(PEG) membranes with different molecular mass cut-offs were used to treat oil/water emulsion, and the effects of experimental conditions including pressure, temperature and different opera-ting modes on permeate flux and removal rate of chemical oxygen demand (CODCr) were studied. The results show that the permeate flux of ultrafiltration membrane is influenced by pressure and temperature; practical pressure is chosen to be 0.3-0.7 MPa for the PEG with molecular mass cut-offs of 8 000 and 0.7-1.0 MPa for the PEG with molecular mass cut-offs of 2 500; and the practical temperature is chosen to be 25-32 ℃. Different operating modes of ultrafiltration also influence the permeate flux and removal rate of CODCr. The ultrafiltration membrane of intermittent cross-flow operating mode is easier to be influenced by blocky polarization and contamination than that of sequential cross-flow operating mode. Removal rate of CODCr in intermittent cross-flow and sequential cross-flow condition can be maintained at about 93%....

    2020-07-08 08:49:41浏览:25 wateremulsionultrafiltrationmembranepermeatefluxchemicaloxygen

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