Kinetics of nitrous acid formation in a two-phase tri- n-butylphosphate–diluent/aqueous nitric acid extraction system under the effect of power ultrasound

The kinetics of nitrous acid formation were investigated in two-phase tri- n-butylphosphate (TBP)–diluent/HNO 3 (1.5–6.0 mol l −1) systems, where diluent is n-C 16H 34, n-C 12H 26, n-C 9H 20 and i-C 8H 18, under the effect of power ultrasound at 20 kHz frequency under Ar atmosphere. The rate of HNO...

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Bibliographic Details
Published in:Ultrasonics sonochemistry 2000-07, Vol.7 (3), p.135-144
Main Authors: Nikitenko, S.I., Moisy, Ph, Venault, L., Madic, C.
Format: Article
Language:English
Subjects:
Hydrocarbons
Nitric acid
Nitrous acid
Power ultrasound
Tri- n-butylphosphate
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Summary:The kinetics of nitrous acid formation were investigated in two-phase tri- n-butylphosphate (TBP)–diluent/HNO 3 (1.5–6.0 mol l −1) systems, where diluent is n-C 16H 34, n-C 12H 26, n-C 9H 20 and i-C 8H 18, under the effect of power ultrasound at 20 kHz frequency under Ar atmosphere. The rate of HNO 2 sonochemical formation decreases with the rise in diluent vapor pressure. The HNO 2 formed is distributed between the aqueous and organic phases due to its extraction with TBP. The kinetics of HNO 2 sonochemical formation in the two-phase system exhibits induction periods due to NO x (NO+NO 2) gas reactions in the HNO 3 medium. This induction period decreases with increasing HNO 3 concentration and ultrasound intensity. The HNO 2 steady-state concentration was obtained under long-time sonication as the result of HNO 2 sonochemical decomposition. HNO 2 decomposes faster under sonication in the aqueous phase than in the organic phase.
ISSN:1350-4177
1873-2828
DOI:10.1016/S1350-4177(99)00038-3