Zsm-5, its preparation and use in ethylbenzene dealkylation

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 39/38 (2006.01) B01J 29/40 (2006.01) B01J 29/44 (2006.01) C07C 4/18 (2006.01)

Patent

CA 2698854

A new configuration of ZSM-5 is provided whereby the crystals have a higher average silica to alumina ratio at the edges of each crystallite than in the centre as determined from a narrow slit line scan profile obtained from SEM/EDX or TEM/EDX elemental analysis. Such ZSM-5 crystals are obtained by a preparation process using L- tartaric acid. The new configuration ZSM-5 provides significantly reduced xylene losses in ethylbenzene dealkylation, especially when combined with silica as binder, and one or more hydrogenation metals selected from platinum, tin, lead, silver, copper, and nickel. Further advantages are found if used in combination with a small crystal size ZSM-5.

L'invention se rapporte à une nouvelle configuration de ZSM-5 dans laquelle les cristaux ont un rapport moyen silice/alumine plus élevé sur les bords de chaque cristallite qu'en leur centre, conformément à la détermination effectuée à partir d'un profil de balayage linéaire à fente étroite obtenu à partir d'une analyse élémentaire de type SEM/EDX ou TEM/EDX. De tels cristaux de ZSM-5 sont obtenus par un procédé de préparation utilisant de l'acide L-tartrique. La ZSM-5 nouvelle configuration permet de réduire de manière significative les pertes en xylène au cours de la désalkylation de l'éthylbenzène, en particulier lorsqu'elle est combinée à de la silice utilisée comme liant et à un ou plusieurs métaux d'hydrogénation choisis parmi le platine, l'étain, le plomb, l'argent, le cuivre, et le nickel. D'autres avantages ont été trouvés en cas d'utilisation en combinaison avec un cristal de ZSM-5 de petite taille.

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