UNEXPECTEDLY LARGE SELECTIVITIES FOR OLEFIN SEPARATIONS UTILIZING SILVER ION IN ION-EXCHANGE MEMBRANES

被引：30

作者：

THOEN, PM ^{[1
]}

NOBLE, RD ^{[1
]}

KOVAL, CA ^{[1
]}

机构：

[1] UNIV COLORADO,DEPT CHEM & BIOCHEM,BOULDER,CO 80309

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1994年 / 98卷 / 04期

关键词：

D O I：

10.1021/j100055a036

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Perfluorosulfonate ionomer membranes (Nafion) that have been ion-exchanged with silver(I) ion exhibit unexpectedly large selectivities for the separation of certain unsaturated hydrocarbon mixtures, such as styrene from ethylbenzene and linear C-5-C-10 dienes from monoenes. Transmembrane fluxes increase linearly with the reciprocal of membrane thickness with no loss of selectivity for membrane thicknesses between 40 and 2.5 mu m. The large selectivities are due to competitive absorption of the hydrocarbons by the membranes. This effect cannot be predicted from single-component experiments or known complexation constants between the hydrocarbon and aqueous Ag(I). The unexpectedly large separation factors for the diene/monoene mixtures can be explained semiquantitatively by invoking the complexation of dienes to two Ag(I) ions.

引用

页码：1262 / 1269

页数：8

共 42 条

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