Granulated activated alumina prepn. - by decomposition of alumina tri:hydrate using fluidised bed
Granulated activated alumina is prepd. by (a) decomposing alumina trihydrate by contacting it with a fluidized bed at 350-600 degrees C for 0.05-0.5, esp 0.05-0.2, seconds to form amorphous hydroxide; (b) mixing the hydroxide with H2O to form an aq. suspension contg. 100-500g/litre calculated as Al...
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Zusammenfassung: | Granulated activated alumina is prepd. by (a) decomposing alumina trihydrate by contacting it with a fluidized bed at 350-600 degrees C for 0.05-0.5, esp 0.05-0.2, seconds to form amorphous hydroxide; (b) mixing the hydroxide with H2O to form an aq. suspension contg. 100-500g/litre calculated as Al oxide; (c) hydrating the hydroxide by heating at 20-100 degrees C and at pH 5-12 for 0.5-10 hours. This is followed by (d) treating with an acid which can form H2O sol. basic salts with Al at 20-150 degrees C; (e) granulating, drying at 20-150 degrees C and calcining the prod. at 400-600 degrees C. The activated prod. is used as an adsorbing material, a catalyst, or a support for active components in the chemical and petrochemical industry. Using a fluidised bed decreases the decompsn. temp. also the specified hydration conditions make it possible to modify within a wide range the pore structure of the end prod. |
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