Process for the preparation of quasi-crystalline boehmites

Details Process for the preparation of quasi-crystalline boehmites Process for the preparation of quasi-crystalline boehmites

C - Chemistry, Metallurgy

01

F

C01F 7/34 (2006.01) B01J 21/04 (2006.01) C01F 7/36 (2006.01) C01F 7/44 (2006.01)

Patent

CA 2381301

The present invention pertains to an improved process for the preparation of quasi-crystalline boehmite. In this improved process a quasi-crystalline boehmite precursor is aged at a pH below 7, preferably under hydrothermal conditions. It was found that when conducting the preparation processes for quasi-crystalline aluminas described in the prior art at a pH below 7 and under hydrothermal conditions instead of the high pH and thermal ageing used in the prior art, QCBs with higher crystallinity are obtained. In the process according to the invention additives may be added to the quasi-crystalline boehmite precursor. This results in a high quality QCB with additives in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group of rare earth metals, alkaline earth metals, transition metals, actinides, silicon, gallium, boron, and phosphorus.

La présente invention concerne un procédé amélioré d'élaboration de boehmite quasi-cristalline. Selon ce procédé, on prend un précurseur de boehmite quasi-cristalline que l'on maintient à un pH inférieur à 7, de préférence dans des conditions hydrothermales. Il est apparu que, lorsqu'on effectuait les procédures d'élaboration d'alumines quasi-cristallines selon l'état antérieur de la technique à un pH inférieur à 7, dans des conditions hydrothermales au lieu de pH élevé et vieillissement thermique selon l'état antérieur de la technique, on obtient des boehmites quasi-cristallines de cristallinité supérieure. Pour le procédé selon l'invention, on peut ajouter des additifs au précurseur de la boehmite quasi-cristalline. On obtient finalement une boehmite quasi-cristalline dans laquelle les additifs sont dispersés de façon homogène. Les additifs convenant sont des composés contenant des éléments tels que des métaux du groupe des lanthanides, des métaux alcalino-terreux, des métaux de transition, des actinides, le silicium, le gallium, le bore et le phosphore.

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