Air Dehydration by Permeation Through Dimethylpolysiloxane/polysulfone Membrane
Shui Wai Lin* and Salvador Valera Lamas
Centro de Graduados e Investigación en Química del Instituto Tecnológico de Tijuana Blvd. Industrial y Av. ITR Tijuana, S/N, Mesa Otay, C.P. 22500, Tijuana, B C., México *e–mail: SL388@AOL.COM
Received June 14, 2010.
Accepted December 10, 2010.
Abstract
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 –50°C at a rate of 310 cm3/s using compressed wet–air (90 psig, 23°C) 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.
Keywords: gas separation, permselective membranes, dimethylpolysiloxane, dry air.
Resumen
El presente trabajo se centra en el diseño, fabricación y evaluación de un dispositivo capaz de producir aire seco, con punto de rocío de –50°C a razón de 310 cm3/s, alimentando aire comprimido (90 psig, 23°C) a un sistema de membranas compuestas por una película delgada de polidimetilsiloxano, soportada sobre una membrana microporosa de polisulfona (PDMS/PS). El módulo deshidratador consiste de una membrana de PDMS/PS en forma de película plana fijada a un soporte cilíndrico, dentro de una cámara apropiada para la separación de gases. El proceso de deshidratación de aire se consigue por medio de la permeabilidad selectiva del H2O(g) en N2 y O2, los cuales son los principales componentes gaseosos del aire que viaja a través de la membrana de PDMS/PS.
Palabras clave: Separación de gases, membranas permioselectivas, polidimetilsiloxano, aire seco.
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