Process for preparing fine particles of metal oxides
AssigneeMontedison S.p.A.
InventorsEnrico Albizzati, Emiliano M. Ceresa, Luciano Zaninetta
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Abstract
A process for preparing spheroid particles of oxide compounds, having an average diameter of smaller than 3 microns. An emulsion is prepared of a hydrolyzable liquid oxide compound in a perfluoropolyether, the emulsion is reacted with water, water vapor or with a mixture, in any ratio, of water with a liquid miscible or immiscible with water so as to form an oxide hydrate which is recovered dried and calcined. Oxide compounds include oxides of Ti, Al, Zr, Si or B.
Claims11
A process for preparing spheroidal particles of an oxide compound selected from the group consisting of Ti, Al, Zr, Si and B, having an average diameter of less than 3 microns, comprising:
- preparing an emulsion in a perfluoropolyether of a hydrolyzable liquid compound of an element selected from the group consisting of Ti, Al, Zr, Si and B;
- reacting the emulsion with water, with water vapor or with a mixture, in any ratio, of water with a liquid miscible or immiscible with water, said liquid not interfering with the reaction of the oxide compound with water, to obtain an oxide hydrate;
- recovering said oxide hydrate, drying and calcining said oxide hydrate to an oxide.
Dependencies are inferred from the claim text.