Chemistry of inorganic compounds – Boron or compound thereof – Binary compound
Patent
1991-09-12
1993-03-16
Group, Karl
Chemistry of inorganic compounds
Boron or compound thereof
Binary compound
501 92, 501 96, 423291, C01B 3500
Patent
active
051942348
ABSTRACT:
Uniform, fine ceramic powder is prepared using an apparatus comprising (a) a cooled reactant transport member; (b) a reactor chamber; (c) a heating means; and (d) a cooling chamber. The reactant transport member comprises a wall defining a conduit that communicates with the reactor chamber, with a gas-flow space being defined along the perimeter of the transport member and in communication with the reactor chamber. The reactor chamber comprises a wall defining a reaction zone, and the heating means is associated with the reaction zone, and adapted for heating reactants in the reaction zone. The cooling chamber comprises a wall defining a cooling zone that communicates with the reactor chamber. In one embodiment the communication is by means of a cooling inlet, the diameter of the cooling zone being larger than the diameter of the cooling inlet. The temperatures of the reactant transport member, the reactor chamber, and the cooling chamber are independently controllable. Reactants can be fed through the reactant transport member into the reaction zone and reacted to form products, and the products then fed into the cooling zone to produce uniform, fine ceramic powders.
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patent: 4017587 (1977-04-01), Ditter et al.
patent: 4282195 (1981-08-01), Hoekje
patent: 4597948 (1986-07-01), Sanjurjo
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patent: 5032242 (1991-07-01), Knudsen et al.
Moore William G.
Roach Raymond P.
Weimer Alan W.
Gallo Chris
Group Karl
Howard D. R.
The Dow Chemical Company
Tribble B. J.
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