Unexpectedly large selectivities for olefin utilizing ion in ion-exchange membranes

Journal Article · Thu Jan 27 04:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100055a036· OSTI ID:5147237

Thoen, P M; Noble, R D; Koval, C A ^[1]

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1. Univ. of Colorado, Boulder, CO (United States)

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[sub 5]-C[sub 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. 44 refs., 9 figs., 7 tabs.

• OSTI ID: 5147237
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:4; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606 -- Other Materials-- Physical Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400100 -- Analytical & Separations Chemistry
400201* -- Chemical & Physicochemical Properties
ABSORPTION
ALKENES
ALKYLATED AROMATICS
AROMATICS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
COMPLEXES
DATA
DIENES
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
ION EXCHANGE
ION EXCHANGE MATERIALS
IONS
KINETICS
MATERIALS
MATHEMATICAL MODELS
MEMBRANES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POLYENES
POLYMERS
REACTION KINETICS
SEPARATION PROCESSES
SILVER IONS
SORPTION
STYRENE
SULFONATES