Air Dehydration by Permeation Through Dimethylpolysiloxane/polysulfone Membrane
Keywords:gas separation, permselective membranes, dimethylpolysiloxane, dry air.
The present work focuses on design, fabrication and evaluation of an air-dehydration membrane system that is capable of producing dry air with a Dew Point of –50ºC at a rate of 310 cm3/s using compressed wet-air (90 psig, 23ºC) as feed to a membrane system of dimethylpolysiloxane thin-film supported by microporous polysulfone substrate (PDMS/PS). The dehydrator element comprises of a flat sheet PDMS/PS membrane fixed to a cylindrical tubular support, the latter is fitted inside an appropriated chamber. The air-dehydration process is achieved by means of selective permeation of H2O(g) over N2 and O2 gases, the major components of the wet- air, through PDMS/PS membrane.
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