Process for recovering nitric acid and hydrofluoric acid from wa

Details Process for recovering nitric acid and hydrofluoric acid from wa Process for recovering nitric acid and hydrofluoric acid from wa

1988-10-27

1990-07-24

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041824, C25D 1300

Patent

active

049433601

ABSTRACT:
A method for regenerating a waste liquor containing nitric acid and hydrofluoric acid to recover highly pure nitric and hydrofluoric acids therefrom. The method comprises adding hydrofluoric acid, or an acid mixture of nitric and hydrofluoric acids having a major content of the hydrofluoric acid, to a nitric acid and hydrofluoric acid waste liquor, and subjecting the resulting mixture to dialysis with an ion-exchange electrodialyzer to recover the dialyzed acids. The acid-removed solution is neutralized to cause a precipitate to form and the precipitate is separated. The resultant solution is subjected to an ion-exchange membrane electrodialyzer using a combination of a bipolar membrane, an anion-exchange membrane and a cation-exchange membrane for separation into the acids and the alkali, which are subsequently recovered. The process has a high current efficiency and high recovery rates for acids.

REFERENCES:
Basta, N., "Use Electrodialytic Membranes for Waste Recovery", Chemical Engineering, vol. 83, No. 5 (Mar. 3, 1986), pp. 42 & 43.
Patent Abstracts of Japan, vol. 11, No. 206, Jul. 3, 1987, & JP-A-62 27 580.

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