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  4. Analysis of gas permeation through composite membranes
 
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1991
Journal Article
Title

Analysis of gas permeation through composite membranes

Abstract
The properties of membranes have to be adjusted to the separation problems. In gas separation solution- diffusion type membranes are usually used. These membranes can be made from polymeric materials such as rubber polymers which have moderate permeabilities and low selectivities or from rigid glassy polymers with low permeabilities and moderate selectivities. Combinations of both types of materials allow a membrane's proper-ties to be tailored to specific separation problems. Such membranes were prepared as composite structures with poly(ethersulfone) for the substructure and poly(dimethylsiloxane) or poly(butadien-styrene) copolymer for the coating laver. Their properties in -as separation were measured with oxygen-nitro-en and carbon dioxidemethane mixtures. The results were correlated with the preparation techniques. Three types of composite membranes could be identified which are referred to as pore-flux-type, mixed-flux-type, and nonpore-flux-type composite membranes. Using three simple models, the results obtained from gas separation tests can be explained and the theoretical thickness of the substructure can be estimated.
Author(s)
Hofmann, T.
Kimmerle, K.  
Strathmann, H.  
Journal
Journal of membrane science  
Conference
Synthetic Membranes in Science and Industry 1989  
Language
English
Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB  
Keyword(s)
  • composite membrane

  • gas separation

  • membrane preparation and structure

  • poly-butadien-styrene

  • poly-dimethylsiloxane

  • poly-ethersulfone-membrane

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