The Selectivity Challenge in Organic Solvent Nanofiltration: Membrane and Process Solutions

Recent development of organic solvent nanofiltration (OSN) materials has been overwhelmingly directed toward tight membranes with ultrahigh permeance. However, emerging research into OSN applications is suggesting that improved separation selectivity is at least as important as further increases in...

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Bibliographic Details
Published in:Annual review of chemical and biomolecular engineering 2017-06, Vol.8 (1), p.473-497
Main Authors: Marchetti, Patrizia, Peeva, Ludmila, Livingston, Andrew
Format: Article
Language:English
Subjects:
Filtration - instrumentation
membrane cascades
membranes
Membranes, Artificial
Nanotechnology - instrumentation
Organic Chemicals - isolation & purification
organic solvent nanofiltration
purification
selectivity figure of merit
Solvents - isolation & purification
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Summary:Recent development of organic solvent nanofiltration (OSN) materials has been overwhelmingly directed toward tight membranes with ultrahigh permeance. However, emerging research into OSN applications is suggesting that improved separation selectivity is at least as important as further increases in membrane permeance. Membrane solutions are being proposed to improve selectivity, mostly by exploiting solute solvent membrane interactions and by fabricating tailored membranes. Because achieving a perfect separation with a single membrane stage is difficult, process engineering solutions, such as membrane cascades, are also being advocated. Here we review these approaches to the selectivity challenge, and to clarify our analysis, we propose a selectivity figure of merit that is based on the permselectivity between the two solutes undergoing separation as well as the ratio of their molecular weights.
ISSN:1947-5438
1947-5446
DOI:10.1146/annurev-chembioeng-060816-101325