Abstract
He/H 2O and He/n-C 5H 12 permeabilities as well as single-component permeabilities were measured on two mesoporous alumina membranes, in order to determine the optimum conditions for separating condensable from non-condensable vapors. The membranes were produced by compaction of non-porous alumina particles and exhibited similar pore structures but different porosities. The results show that, if the relative pressure of the condensable vapor in the condensable/non-condensable mixture is properly selected, very high selectivity and permeability values can be achieved simultaneously. The optimum relative pressure of the condensable vapor corresponds, in all cases studied, to the maximum condensable vapor permeability and to a relative gas permeability of zero. The pressure gradient of the condensable vapor across the membrane should be kept small, to avoid the formation of low permeability regions at either end of the membrane.
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