Purification of (Nb.sub.1-x Ta.sub.x).sub.2 O.sub.5

Details Purification of (Nb.sub.1-x Ta.sub.x).sub.2 O.sub.5 Purification of (Nb.sub.1-x Ta.sub.x).sub.2 O.sub.5

1986-12-18

1988-07-12

Garvin, Patrick P.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423592, C01G 3300, C01G 3500

Patent

active

047569018

ABSTRACT:
(Nb.sub.1-x Ta.sub.x).sub.2 O.sub.5 ("NTO") is purified of undesirable impurity elements present in small amounts by contacting the NTO in finely divided form to an extraction phase containing chloride, bromide, or iodide ions at a temperature whereat the ions react to remove the impurities into the extraction phase, and then the extraction phase is separated from the finely divided NTO. The process is particularly valuable in removing 3d impurities such as iron and titanium. The process can be carried out by liquid phase extraction, as with an azeotropic aqueous hydrochloric acid extraction from the NTO, or by gas phase reaction, as by reacting carbon tetrachloride with the NTO.

REFERENCES:
patent: 3437430 (1969-04-01), Bielecki et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd Ed. (1983), vol. 22, pp. 548-549.

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