Process for recovery of reusable chromic acid from the waste chr

Details Process for recovery of reusable chromic acid from the waste chr Process for recovery of reusable chromic acid from the waste chr

1977-04-12

1979-03-13

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 97, 204180P, 210 21, 423 54, C25B 100, B01D 1100, C01G 3712, C01G 3714

Patent

active

041441451

ABSTRACT:
A process for recovery of reusable chromic acid from waste chromic acid solution containing impurities, which process comprises a first step in which the solution containing chromic acid is introduced into the cathode compartment in an electro-dialysis process and free chromic acid or chromate ions in the above solution are transferred to the anode compartment, a second step in which H.sub.2 SO.sub.4 is added in at least equivalent amounts to the heavy metallic ion contained in the outlet solution, in which chromic acid ion concentration is reduced, in order to convert chemical species of the contained metallic ion and increase the H.sup.+ ion concentration and then chromate ions in the resultant solution are extracted into an organic phase with contact of an organic solvent (A), and a third step in which residual amounts of chromic acid ion remaining in the aqueous raffinate from the second step are extracted into an organic phase with contact of an organic solvent (B). Organic solvents A and B are regenerated by stripping the organic phase with a suitable strip reagent.

REFERENCES:
patent: 3423300 (1969-01-01), Joo et al.
patent: 3856916 (1974-12-01), LeFrancois et al.
patent: 3856917 (1974-12-01), Texier et al.
patent: 4029734 (1977-06-01), Stauter et al.
T. S. West et al., Metallurgia, pp. 47-51, Jul. 1956.
A. A. Yadav et al., Indian Jour. of Chem., vol. 8, pp. 290-292, Mar. 1970.

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