Asymmetric solute transport and solvent flux in dual-skinned hollow fiber membranes

Paul J. Soltys, Norma J. Ofsthun, Andrew Zydney

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Dual-skinned hollow fiber membranes were produced with thin skins on both the inner (lumenal) and outer surfaces of an annular macroporous matrix. These dual-skinned membranes demonstrated a clear directional selectivity with sieving coefficients that were dramatically different in the two flow directions (shell-to-lumen and lumen-to-shell). Unlike the incidental directional selectivity previously reported with single-skinned reverse osmosis membranes, sieving coefficients in both directions are controllable by varying the properties of the two skin layers. The directional sieving behavior of these membranes is a result of the directional nature of the convective solute transport across a membrane having two skin layers with different effective pore sizes. Internal concentration polarization significantly increases solute sieving coefficients when flow occurs through the more open skin layer first, but is largely absent when the flow is in the other direction. The internal concentration polarization also has a strong effect on the solvent flux through these membranes causing large directional differences in flux during filtration of a dilute macromolecular solution. The unique transport characteristics of these dual-skinned membranes thus provide an extraordinarily powerful tool for the design and development of novel membrane devices and processes that exploit the directional selectivity of these new membrane structures.

Original languageEnglish (US)
Pages (from-to)199-212
Number of pages14
JournalJournal of Membrane Science
Volume118
Issue number2
DOIs
StatePublished - Sep 18 1996

Fingerprint

Solute transport
hollow
solutes
Fluxes
membranes
Membranes
fibers
Fibers
Skin
lumens
selectivity
Polarization
Osmosis membranes
flow coefficients
Membrane structures
reverse osmosis
membrane structures
Reverse osmosis
Osmosis
polarization

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Cite this

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abstract = "Dual-skinned hollow fiber membranes were produced with thin skins on both the inner (lumenal) and outer surfaces of an annular macroporous matrix. These dual-skinned membranes demonstrated a clear directional selectivity with sieving coefficients that were dramatically different in the two flow directions (shell-to-lumen and lumen-to-shell). Unlike the incidental directional selectivity previously reported with single-skinned reverse osmosis membranes, sieving coefficients in both directions are controllable by varying the properties of the two skin layers. The directional sieving behavior of these membranes is a result of the directional nature of the convective solute transport across a membrane having two skin layers with different effective pore sizes. Internal concentration polarization significantly increases solute sieving coefficients when flow occurs through the more open skin layer first, but is largely absent when the flow is in the other direction. The internal concentration polarization also has a strong effect on the solvent flux through these membranes causing large directional differences in flux during filtration of a dilute macromolecular solution. The unique transport characteristics of these dual-skinned membranes thus provide an extraordinarily powerful tool for the design and development of novel membrane devices and processes that exploit the directional selectivity of these new membrane structures.",
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Asymmetric solute transport and solvent flux in dual-skinned hollow fiber membranes. / Soltys, Paul J.; Ofsthun, Norma J.; Zydney, Andrew.

In: Journal of Membrane Science, Vol. 118, No. 2, 18.09.1996, p. 199-212.

Research output: Contribution to journalArticle

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