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Possible air separations with superconducting membranes

✍ Scribed by Ryan D. Gordon; E. L. Cussler

Publisher
American Institute of Chemical Engineers
Year
1999
Tongue
English
Weight
518 KB
Volume
45
Category
Article
ISSN
0001-1541

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✦ Synopsis

Abstract

Permeabilities of oxygen, nitrogen and helium across porous, superconducting membranes with 5‐μm pores are consistent with those across nonsuperconducting membranes with well‐defined pores of similar sizes. This is true both at ambient and superconducting temperatures. Transport can occur by Knudsen diffusion, Poiseuille flow, capillary condensation, and turbulent flow. There is no evidence of surface diffusion. Theoretical considerations of superconducting membranes are consistent with these results, indicating when superconductivity might play a role. However, past reports concerning air separation with superconducting membranes with these micrometer‐sized pores are questionable.

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