Abstract

Criteria for membrane comparison are presented based on two structural parameters. Using a transport model that accounts for steric and hydrodynamic effects, an average pore radius for various commercial polysulfone membranes was calculated from solute sieving experiments. The number of pores per unit membrane area divided by the pore length was estimated using the Hagen-Poiseuille equation. The average membrane pore radius governs separation, while the ratio of the number of pores per unit membrane area to the pore length describes the flux through a membrane. Performance limits of commercially available polysulfone membranes are presented.

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