Abstract
The performance of porous membranes is tremendously influenced by desorption, as alkane separations by a pressure stable MFI membrane revealed.
Highlights
The performance of porous membranes is tremendously influenced by desorption, as alkane separations by a pressure stable MFI membrane revealed
Non-swellable zeolite membranes were not applicable since they lost in direct competition with polymer membranes in terms of selectivity
A ve-step step transport model has been proposed for adsorption driven zeolite membrane separation including: (1) adsorption at the external surface; (2)
Summary
The performance of porous membranes is tremendously influenced by desorption, as alkane separations by a pressure stable MFI membrane revealed. Additional to differences in occupancy/loading of components, a preferential adsorption of one component hinders the permeation of the other one leading to higher separation selectivities.[18] For example, the preferential enrichment of a higher alkane from mixtures consisting of methane/ethane or ethane/isobutene was reported for silicalite-1 and composite alumina–MFI zeolite membranes, respectively.[19,20] the operating parameters – pressure and temperature – are considered to be the important control variables in uencing the membrane performance.[15,19] The temperature essential to achieve the maximum permeation ux of a single component through the membrane increases with the adsorption strength of the molecule.[21,22] The positive in uence of an increased
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