Process for the preparation of anionic clay

C - Chemistry – Metallurgy – 01 – F

Patent

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Details

C01F 7/00 (2006.01) B01J 21/16 (2006.01) B01J 23/00 (2006.01) B01J 37/00 (2006.01)

Patent

CA 2437556

This invention relates to a process for preparing a 3R1-type crystalline anionic clay comprising the steps of: a) preparing an aqueous precursor mixture comprising aluminium trihydrate or a thermally treated form thereof and a magnesium source, the magnesium source being milled before use of when present in the precursor mixture; b) aging the precursor mixture at temperatures in the range 30~ - 100 ~C to obtain the crystalline clay product; and c) optionally shaping the product of step b. Milling of the magnesium source, either alone or in combination with the (thermally treated) aluminium trihydrate, results in a faster reaction and higher conversion to anionic clay. The resulting anionic clay can be obtained by simply drying the slurry retrieved from the reactor. There is no need for washing or filtering, and a wide range of ratios of Mg/Al in the reaction product is possible.

L'invention concerne un procédé de fabrication d'argile anionique cristalline du type 3R¿1?, consistant à: a) préparer d'abord un mélange précurseur aqueux contenant du trihydrate d'aluminium, ou une forme thermiquement traitée de celui-ci, ainsi qu'une source de magnésium, cette source étant broyée avant utilisation ou lorsqu'elle se trouve dans le mélange précurseur; b) faire vieillir ensuite le mélange précurseur à des températures comprises entre 30 et 100 ·C pour obtenir le produit à base d'argile cristalline; et enfin, c) façonner éventuellement le produit de l'étape b. Le broyage de la source de magnésium, seule ou associée au trihydrate d'aluminium (thermiquement traité), permet d'accélérer la réaction et d'améliorer la conversion en argile anionique. On peut obtenir l'argile anionique résultante en séchant simplement la suspension extraite du réacteur. Par ailleurs, on peut se dispenser des opérations de lavage et de filtration et obtenir une large plage de rapports Mg/Al dans le produit de réaction.

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