Evidence for parallel pathways in the facilitated transport of alkenes through Ag{sup +}-exchanged Nafion films

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie9503306· OSTI ID:238033

Rabago, R; Bryant, D L; Koval, C A; Noble, R D ^[1]

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

Facilitated transmembrane fluxes for feed solutions containing 1,5-hexadiene, 1-hexene, and n-hexane are reported for hydrated Ag{sup +}-Nafion membranes that vary in thickness between 8 and 155 {mu}m. Fluxes for n-hexane are virtually undetectable. Analysis of the fluxes for 1,5-hexadiene and 1-hexene suggests that two transport pathways are operating in parallel. The fluxes associated with one pathway are inversely proportional to membrane thickness and lead to a limiting diene/monoene separation factor of 47. The fluxes associated with the second pathway are independent of membrane thickness and lead to a limiting separation factor of 100. The differences in the selectivity for the two pathways result in separation factors for the 8--155 {mu}m membranes ranging from 50 to 70. Concentrations of solutes in the membranes under equilibrium and transport conditions and the rate of 1,5-hexadiene extraction from membranes as a function of time are determined and are used to infer properties associated with the two pathways.

• OSTI ID: 238033
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 4 Vol. 35; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
DIENES
EFFICIENCY
HEXENES
MEMBRANE TRANSPORT
MEMBRANES
PERFORMANCE
SEPARATION PROCESSES
SILVER COMPOUNDS