Thermal stability of mixtures of the extractant and nitric acid at temperatures from 90 to 120°С

The thermal stability of mixtures of tri- n -butyl phosphate (TBP) with HNO 3 was studied in the temperature range from 90 to 125°C. In mixtures with the irradiated extractant at 110°C, intense exothermic processes initiated by oxidation of extractant radiolysis products are possible, whereas at 90°...

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Bibliographic Details
Published in:	Radiochemistry (New York, N.Y.) Vol. 52; no. 1; pp. 56 - 59
Main Authors:	Nazin, E. R., Zahinyaev, G. M., Belova, E. V., Tkhorzhnitskii, G. P., Ryabova, E. V.
Format:	Journal Article
Language:	English
Published:	Dordrecht SP MAIK Nauka/Interperiodica 01-02-2010
Subjects:	Chemistry Chemistry and Materials Science Chemistry/Food Science Nuclear Chemistry nitric acid tributyl phosphate thermal oxidation thermal effects
Online Access:	Get full text
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Summary:	The thermal stability of mixtures of tri- n -butyl phosphate (TBP) with HNO 3 was studied in the temperature range from 90 to 125°C. In mixtures with the irradiated extractant at 110°C, intense exothermic processes initiated by oxidation of extractant radiolysis products are possible, whereas at 90°C oxidation of the irradiated extractant is accompanied by weak heat and gas evolution. In the temperature range from 110 to 120°C, exothermic oxidation processes in nonirradiated mixtures start after long induction period (hours), develop gradually, and do not have an avalanche character. Below 110°C, heating of mixtures of the extractant with HNO 3 at the HNO 3 concentration from 8 to 15.7 M is accompanied by gas evolution without exothermic effects. On the whole, oxidation processes in extraction mixtures at temperatures below the “start” parameters of thermal explosion are not dangerous from the viewpoint of the probability of thermal explosion, even at prolonged heating.
ISSN:	1066-3622 1608-3288
DOI:	10.1134/S1066362210010121