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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Hauptverfasser: P. DRUSCHININ,IVAN, A. LEVICKIJ,EMMANUIL, A. SCHKRABINA GEB. PERELMAN,RIMMA, I. LJUBUSCHKO GEB. IVANOVA,GALINA, M. MOROZ,ELLA, N. BADAEV,BORIS, N. ISAEV,BORIS, E. CHRAMOV,ALEKSANDR, A. RODIONOVA,NINA, M. ANDRUSCHKEVITSCH,MICHAIL, N. EROFEEV,VLADIMIR, A. PACHOMOV,NIKOLAJ, K. BORESKOV,GEORGIJ, A. BAUM,BRONISLAV, M. KNJAZEV,VLADIMIR, K. VOROBIEV,JURIJ, G. CHOMJAKOVA,LJUDMILA
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Sprache:eng ; ger
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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.