Method for improving ruthenium decontamination efficiency in nit

Details Method for improving ruthenium decontamination efficiency in nit Method for improving ruthenium decontamination efficiency in nit

1983-11-10

1985-07-02

Doll, John

Distillation: processes, separatory

Distilling to separate or remove only water

From nitric acid

159 471, 203 29, 203 32, 252632, 423 2, 423 22, G21F 914

Patent

active

045266581

ABSTRACT:
A method for improving ruthenium decontamination efficiency in a nitric acid recovery system in which a nitric acid solution containing ruthenium is subjected to an evaporation treatment in a nitric acid evaporator. The method is characterized by carrying out the evaporation treatment of the nitric acid solution in the presence of hydrazine in a concentration of 20 to 5000 mg per liter of the solution in the evaporator. By the action of hydrazine, the evaporation of ruthenium contained in the solution is suppressed during the evaporation treatment, and hence the ruthenium decontamination efficiency is remarkably improved.

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patent: 3158577 (1964-11-01), Bray et al.
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patent: 3862296 (1975-01-01), Dotson et al.
patent: 3962114 (1976-06-01), Berreth
Kirk-Othmer, Encyclopedia of Chemical Technology, vol. 15, Third Edition, (1981), John Wiley & Sons, pp. 855, 856.
Kirk-Othmer, Encyclopedia of Chemical Technology, vol. 12, Third Edition, (1981), John Wiley & Sons, p. 741.

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