Crystalline boehmite materials as precursors for large crystal gamma alumina and low surface area alpha alumina
AssigneeBASF SE
InventorsKarl C. Kharas, Danna Mooney
Life of this patent
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Abstract
A process for preparing crystalline boehmite includes combining a stoichiometric amount of flash calcined gibbsite (AI2O3) and gibbsite (Al(OH)3) in a pressurizable reaction vessel; heating the flash calcined gibbsite and gibbsite in the reaction vessel to a temperature of about 200° C. to about 280° C. and for a time sufficient to form crystalline boehmite. A crystalline boehmite exhibiting a crystallite from about 600 Å to about 850 Å when measured in the 120 direction of the crystallographic space group Cmcm.
Claims13
A process for preparing crystalline boehmite, the process comprising:
- combining a stoichiometric amount of flash calcined gibbsite (Al2O3) and gibbsite (Al(OH)3) in a pressurizable reaction vessel;
- heating the flash calcined gibbsite and gibbsite in the reaction vessel to a temperature of about 200° C. to about 280° C. and for a time sufficient to form crystalline boehmite wherein the combining of the stoichiometric amount of flash calcined gibbsite and gibbsite is at a 1:1 molar ratio of flash calcined gibbsite Al2O3 to gibbsite Al(OH)3.
A process for preparing a transitional alumina, the process comprising:
- preparing crystalline boehmite via a process comprising:
- combining a stoichiometric amount of flash calcined gibbsite (Al2O3) and gibbsite (Al(OH)3) in a pressurizable reaction vessel;
- heating the flash calcined gibbsite and gibbsite in the reaction vessel to a temperature of about 200° C. to about 280° C. and for a time sufficient to form crystalline boehmite;
- and
- calcining the crystalline boehmite to form the transitional alumina wherein the combining of the stoichiometric amount of flash calcined gibbsite and gibbsite is at a 1:1 molar ratio of flash calcined gibbsite Al2O3 to gibbsite Al(OH)3.
Dependencies are inferred from the claim text.