Process for production of pure tungstic acid or molybdic acid fr

Details Process for production of pure tungstic acid or molybdic acid fr Process for production of pure tungstic acid or molybdic acid fr

1989-09-14

1990-12-04

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204301, B01D 5702

Patent

active

049751670

ABSTRACT:
Acidification of impure alkali or ammonium tungstate or molybdate solutions prior to electrodialysis to produce tungstic acid or molybdic acid is carried out by the addition of pure tungstic acid or molybdic acid as the salts of tungsten isopolyacids or molybdenum isopolyacids, respectively. This is less expensive than using pure HCl or H.sub.2 SO.sub.4 and prevents contamination with chloride or sulfate ions. The pure tungstic acid or molybdic acid is isolated from the product.

REFERENCES:
patent: 4234333 (1980-11-01), Ghandehari
patent: 4279869 (1981-07-01), Coulson
patent: 4439293 (1984-03-01), Vaughan

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