Method of producing halide-free metal and hydroxides

Details Method of producing halide-free metal and hydroxides Method of producing halide-free metal and hydroxides

1986-06-03

1988-05-03

Garvin, Sr., Patrick P.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 63, 423 66, 423 69, 423608, 423609, 423611, C01B 1314, C22B 3424

Patent

active

047418940

ABSTRACT:
Niobium (V) and tantalum (V) halides are converted to Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5 that are free of detectable levels of halide in a two step process. In the first step, the metal halide is reacted with an alcohol and with a replacement species, such as ammonia, which reacts with the halide. This produces a metal alkoxide which is soluble and a halide salt of the replacement species which is insoluble in the alcohol and precipitates. After physically separating the alkoxide in alcohol solution from the precipitate, in a second step, the metal alkoxide is hydrolyzed with purified water to produce the oxide.

REFERENCES:
patent: 4507245 (1985-03-01), Ozaki et al.
patent: 4543341 (1985-09-01), Barringer et al.
patent: 4673554 (1987-06-01), Niwa et al.
Kirk Othmer, Encyclopedia of Chemical Technology, Third Ed., vol. 2, Alkoxides, Metal to Antibiotics Peptides, p. 218, 1973.
D. C. Bradley, R. C. Mehrotra & D. P. Gaur, Metal Alkoxides, Academic Press, London (1978) pp. 13-15,150-151,165-166, 345,360.

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