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The physical basis for solvent flow in organic solvent nanofiltration
Hanqing Fan1, Jinlong He2, Mohammad Heiranian1,3
1Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520-8286, USA.
Organic solvent nanofiltration (OSN) membranes facilitate chemical separations. New research shows solvent flow is pressure-driven, with molecules migrating in clusters, not by diffusion, advancing OSN technology.
Area of Science:
- Membrane science
- Chemical engineering
- Materials science
Background:
- Organic solvent nanofiltration (OSN) is a key technology for chemical separations.
- Fundamental understanding of solvent transport mechanisms in OSN membranes is lacking.
Purpose of the Study:
- To elucidate the fundamental mechanisms governing solvent transport in OSN membranes.
- To challenge the prevailing diffusion-based model of solvent transport.
Main Methods:
- Extended Flory-Rehner theory
- Nonequilibrium molecular dynamic (MD) simulations
- Organic solvent transport experiments
Main Results:
- Solvent flow in OSN membranes is driven by a pressure gradient.
- Solvent molecules migrate as clusters through interconnected pore pathways.
- Solvent permeance depends on solvent-membrane affinity, influencing pore structure.
Conclusions:
- Solvent transport in OSN is a pressure-gradient-driven, cluster-migration process.
- This finding challenges the traditional diffusion-based transport model.
- Insights provide a basis for designing advanced OSN membranes.
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