Process for preparing shaped particles from rehydratable alumina
AssigneeAmerican Cyanamid Company
InventorWilliam Edward Bambrick
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Abstract
Disclosed is a process for preparing shaped alumina particles for catalysts or catalyst supports by passing droplets of an aqueous slurry of a rehydratable alumina composition through a shaping medium, such as a column of water-immiscible liquid. The alumina composition undergoes rehydration while being shaped as it passes through the shaping medium, and accordingly, firm, discrete alumina bodies are produced.
Claims7
In a method for producing shaped alumina particles suitable for use as catalysts and catalyst supporting comprising preparing an aqueous slurry of an alumina composition containing a substantial portion of a rehydratable alumina, shaping the alumina into desired form, rehydrating to harden the shaped alumina, and curing, drying, and calcining the shaped alumina particles to produce catalyst and catalyst support material, an improvement comprising introducing an aqueous slurry consisting essentially of water and an alumina containing a substantial portion of a rehydratable alumina to a shaping medium selected from
- a. a water immiscible phase into which droplets of said alumina slurry are introduced to be shaped by surface tension forces into a spherical beaded form, and
- b. tubing of desired cross-sectional size and shape to shape said alumina into extrudate form,
- whereby the alumina is fashioned into a desired configuration, and applying heat to said shaping medium to rehydrate and harden the alumina while it is being subjected to the influence of the shaping medium.
Dependencies are inferred from the claim text.