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A thermodynamic model is presented for nitric acid and water extraction equilibria by tri-n-butylphosphate (10, 30, 50 and 100 vol%) in dodecane from aqueous solutions containing nitric acid (0-14M) and in presence or not of a salting-out agent (lithium nitrate, ammonium nitrate). The activity coefficient of nitric acid was calculated from experimental data using MIKULIN's equation, and those of the components in the organic phase were calculated by SERGIEV SKI I-D ANNUS’ equation. A satisfactory description of the distribution of nitric acid and water is obtained in a wide range of acidity of the aqueous phase by taking into account the formation of the following complexes: TBP, TBPH2O, HNO3H2O,TBP HNO3,(TBP)2HNO3H2O,TBP.(HNO3)2
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Mokili et al. (1995) studied this question.
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