Hydrothermally stable alumina

Details Hydrothermally stable alumina Hydrothermally stable alumina

B - Operations, Transporting

01

J

B01J 20/32 (2006.01) B01D 15/00 (2006.01) B01D 53/02 (2006.01) B01J 20/08 (2006.01)

Patent

CA 2651503

The hydrothermal stability of transition aluminas used as adsorbents and catalyst carriers is improved through their treatment with a soluble silicon inorganic compound such as sodium silicate wherein the silicon compound is mixed with the alumina powder at the production stage of forming particulates by liquid addition. The silicon containing particulates are activated by heating at a temperature lower than 500°C and treated, before or after the thermal activation, by a colloidal silica solution to produce a hydrothermally stable, low dust alumina. The total silica content of the final product is typically less than 5 mass-%.

La stabilité hydrothermique des alumines de transition utilisées comme adsorbants et supports de catalyseurs est améliorée par leur traitement avec un composé inorganique de silicium soluble tel que le silicate de silicium. Le composé de silicium est mélangé à de la poudre d'alumine à l'étage de production où se forment les matières particulaires par addition de liquide. Les matières particulaires contenant le silicium sont activées par chauffage à une température inférieure à 500 °C et traitées, avant ou après activation thermique, par une solution de silice colloïdale de façon à produire une alumine à faible teneur en poussières, hydrothermiquement stable. La teneur totale en silice du produit final est généralement inférieure à 5 % en masse.

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