Abstract

BISSETT, Hertzog  and  KRIEG, Henning M. Synthesis of a composite inorganic membrane for the separation of nitrogen, tetrafluoromethane and hexafluoropropylene. S. Afr. j. sci. [online]. 2013, vol.109, n.9-10, pp.01-08. ISSN 1996-7489.

The advanced use of inorganic membranes, such as zeolites, in large-scale industrial processes is hindered by the inability to manufacture continuous and defect-free membranes. We therefore aimed to construct such a defect-free membrane. Various zeolites were synthesised on the inner surface of a-alumina support tubes by a hydrothermal process. Gas permeation properties were investigated at 298 K for single component systems of N₂, CF₄ and C₃F₆. Ideal selectivities lower than Knudsen selectivities were obtained as a result of defects from intercrystalline slits and crack formation during synthesis and template removal. A composite ceramic membrane consisting of a ceramic support structure, a mordenite framework inverted intermediate zeolite layer and a Teflon AF 2400 top layer was developed to improve separation. The Teflon layer sealed possible defects present in the separation layer forcing the gas molecules to follow the path through the zeolite pores. Ideal selectivities of 88 and 71 were obtained for N₂/CF₄ and N₂/C₃F₆ respectively. Adsorption experiments performed on materials present in the membrane structure suggested that although adsorption of C₃F₆ onto Teflon AF 2400 compared to CF₄ results in a considerable contribution to permeation for the composite ceramic membrane, the sealing effect of the zeolite layer by the Teflon layer is the reason for the large N₂/CF₄ and N₂/C₃F₆ selectivities obtained. The Teflon layer effectively sealed intercrystalline areas in-between zeolite crystals, which resulted in high ideal selectivies for N₂/CF₄ and N₂/C₃F₆.

Keywords : N₂; CF₄; C₃F₆; zeolite; Teflon AF 2400; sealing layer; gas.

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