Asian Pacific Confederation of Chemical Engineering congress program and abstracts
Asian Pacific Confederation of Chemical Engineers congress program and abstracts
Session ID : 1P-12-008
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Separation of C6 Isomers through a High Silica MFI-type Zeolite Membrane
Jun KaneshiroMasahiko MatsukataYasushi SekineEiichi Kikuchi
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In this study, a compact MFI-type zeolite membrane was prepared by a secondary growth method. Seed crystals of MFI-type zeolite were hydrothermally synthesized at 135°C and recovered by centrifugation. A porous alumina tube was used as a support and seeded by dip coating using a slurry of the seeds. Hydrothermal treatment was carried out at 125°C for 24 h to grow a thin layer of MFI-type zeolite on the support. The separation of an equimolar mixtures of C6 hydrocarbon isomers, n-hexane, 2-methylpentane and 2,2-dimethylbutane, was carried out by a vapor permeation method. As a result of separation tests, the membrane showed a high n-Hex selectivity at 100°C. The permeation tests using the binary mixtures of n-Hex/2,2-DMB and n-Hex/2-MP and using the unary systems of these three kinds of molecules were carried out to explain that the appearance of the permselectivity to n-Hex. Molecular sieving effect caused the appearance of the permselectivity to n-Hex against 2,2-DMB and preferential adsorption of n-Hex enhanced its permselectivity. In the case of the selectivity of n-Hex against 2-MP, both differences in the amounts of adsorption and diffusion coefficients of C6 isomers may contribute to determining the permeances of C6 isomers.

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© 2004 The Society of Chemical Engineers, Japan
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