O-16/O-18 AND H/D SEPARATION FACTORS FOR LIQUID VAPOR PERMEATION OF WATER THROUGH AN HYDROPHOBIC MEMBRANE

被引：22

作者：

CHMIELEWSKI, AG

ZAKRZEWSKATRZNADEL, G

MILJEVIC, NR

VANHOOK, WA

机构：

[1] BORIS KIDRIC INST NUCL SCI, YU-11001 BELGRADE, YUGOSLAVIA

[2] UNIV TENNESSEE, DEPT CHEM, KNOXVILLE, TN 37996 USA

来源：

JOURNAL OF MEMBRANE SCIENCE | 1991年 / 60卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

ISOTOPE SEPARATION; LIQUID VAPOR PERMEATION; POLYTETRAFLUOROETHYLENE MEMBRANE;

D O I：

10.1016/S0376-7388(00)81543-4

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Liquid/vapor permeation of water through commercial grade hydrophobic PTFE membranes at 323 < P(Torr) < 160, shows enhancements in logarithmic separation factors, ln[alpha(i'/i)] = ln[(x'/x)downstream/(x'/x)upstream], which differ markedly for isotope separation of oxygen and hydrogen. The prime refers to the lighter isotope and x is the mole fraction. Thus ln[alpha(16/18)] is found to be as large as 6 times the ratio of the vapor pressure isotope effect, ln(alpha-o = ln (P(o')/P(o)), but ln[alpha(H/D)]/ln[alpha-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 O-16/O-18 may be of practical interest.

引用

页码：319 / 329

页数：11

共 22 条

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