Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1985-06-10
1987-07-07
Doll, John
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
423592, C01E 702, C01E 730, C01E 736, C01B 1314
Patent
active
046786570
ABSTRACT:
The invention comprises a process for the production of high purity substantially spherical metal oxide particles using seed nuclei without introducing impurities into the desired product which comprises forming a metal alkoxide vapor; reacting the vapor with a non-reactive gas containing sufficient water vapor to hydrolyze a portion of the metal alkoxide vapor to form solid seed nuclei of metal hydroxide; cooling the remaining metal alkoxide vapor containing the metal hydroxide seed nuclei sufficiently to form an aerosol comprising finely divided metal alkoxide liquid condensed on the solid metal hydroxide seed nuclei; hydrolyzing the metal alkoxide aerosol by contact with water vapor to hydrolyze the metal alkoxide liquid to form substantially spherical metal hydroxide particles; and calcining the substantially spherical metal hydroxide particles to form the corresponding metal oxide.
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Ingebrethsen, B. J., and Matijevic, E., "Kinetics of Hydrolysis of Metal Alkoxide Aerosol Droplets in the Presence of Water Vapor", Journal of Colloid and Interface Science, vol. 100, No. 1, Jul., 1984, pp. 1-16.
Ingebrethsen, B. J., and Matijevic, E., "Preparation of Uniform Colloidal Dispersions by Chemical Reactions in Aerosols-2, Spherical Particles of Aluminum Hydrous Oxide", Journal of Aerosol Science, vol. 11, 1980, pp. 271-280.
Visca, M. and Matijevic, E., "Preparation of Uniform Colloidal Dispersions by Chemical Reactions in Aerosols 1, Spherical Particles of Titanium Dioxide", Journal of Colloid and Interface Science, vol. 68, No. 2, Feb., 1979, pp. 308-319.
Centro Ricerche Novara, Instituto Guido Donegani, "Monodisperse Titanium Dioxide Production: Product and Applications".
Marra Robert A.
Sood Ajay
Alexander Andrew
Aluminum Company of America
Doll John
Pak Chung K.
Taylor John P.
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