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O/O and H/D separation factors for liquid/vapor permeation of water through an hydrophobic membrane |
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| Authors: | Andrez G. Chmielewski Grazyna Zakrzewska-Trznadel Nada R. Miljevic W.Alexander Van Hook |
| Affiliation: | a Institute of Nuclear Chemistry and Technology, 03-195 Warszawa, Dorodna 16 Poland b Boris Kidric Institute of Nuclear Science, Vinca, 11001 Belgrade, P.O. Box 522 Yugoslavia c Chemistry Department, University of Tennessee, Knoxville, TN 37996-1600 USA |
| Abstract: | Liquid/vapor permeation of water through commercial grade hydrophobic PTFE membranes at 323<P(Torr)<160, shows enhancements in logarithmic separation factors, ln[(i'/i)] = In [(χ'/χ) downstream/ (χ'/χ) upstream], which differ markedly for isotope separation of oxygen and hydrogen. The prime refers to the lighter isotope and χ is the mole fraction. Thus ln[(16/18)] is found to be as large as 6 times the ratio of the vapor pressure isotope effect, ln(o = ln (Po'/Po), but ln[(H/D)]/ln[o(H/D)] is only as large as 1.3. The difference in enhancement factors indicates that membrane transport mechanisms must be different for the two separations. The unusually large separation factor for 16O/18O may be of practical interest. |
| Keywords: | isotope separation liquid/vapor permeation polytetrafluoroethylene membrane |
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