Equilibrium Study for the System Tri-n-butyl Phosphate, Normal Paraffin Hydrocarbon, and Nitric Acid

Abstract

Tri-n-butyl phosphate (TBP) in diluent is generally used as a solvent for the extraction of fissile materials in the reprocessing of spent fuels by the PUREX process. The mutual solubility of TBP and water leads to the transfer of some finite amount of TBP into the aqueous phase. The distribution study of TBP between normal paraffin hydrocarbon (NPH) and nitric acid has been studied. Equilibrium curves have been generated for TBP in different concentrations of nitric acid and NPH. The distribution coefficient (K d ) is also calculated by measuring the concentration of associated TBP in the aqueous and organic phase. The effect of an inert diluent on the solubility of TBP in nitric acid is also studied. It has been found that the distribution coefficient value varies with the concentration of TBP, nitric acid, and NPH. Nitric acid partitioning between TBP and water has also been studied. The concentration of nitric acid in both phases was determined by the titration method. It has also been proven that the concentration of nitric acid varies during this equilibrium study due to 1:1 complex formation with TBP by hydrogen bonding. The equilibrium study of this TBP-NPH-nitric acid system will aid in finding out the amount of TBP in different concentrations of nitric acid in the presence of a diluent. This study will be useful in nuclear waste management generated by spent fuels of reprocessing origin.

Extraction Studies of Phosphoric Acid Tributyl Ester from Nitric Acid Solutions Using Dodecane in the Presence of Inextractable Metal Nitrates

“…It has been found that the extraction of nitric acid by TBP increases with the concentration of nitric acid in the aqueous phase and hence distribution coefficient K d of nitric acid increases. The result obtained is in agreement with that reported by Bajoria et al…”

“…It has been observed from Figures – that the distribution coefficient K d of TBP increases with the increase in TBP concentration from (0.019 to 17.445) mol·kg –1 in the organic phase. The results obtained are in concordance with that reported by Bajoria et al K d of TBP is the ratio of concentration of TBP in the organic phase to that in the aqueous phase. As the concentration of TBP increases in the organic phase, a greater amount of TBP is transferred into the aqueous phase and distribution coefficient K d of TBP increases.…”

“…The distribution coefficient values K d obtained for nitric acid have been compared with the previously obtained distribution coefficient values of nitric acid in the absence of metal nitrates . The results obtained reveal that the transfer of nitric acid into the organic phase increases and thus distribution coefficient values increase with the presence of these inextractable metal nitrates in the aqueous phase.…”

“…The result obtained is in agreement with that reported by Bajoria et al 17 The distribution coefficient values K d obtained for nitric acid have been compared with the previously obtained distribution coefficient values of nitric acid in the absence of metal nitrates. 17 The results obtained reveal that the transfer of nitric acid into the organic phase increases and thus distribution coefficient values increase with the presence of these inextractable metal nitrates in the aqueous phase. Sodium nitrate and calcium nitrate are inextractable metal nitrates, and their presence in the aqueous phase along with nitric acid eliminates any competition for complex formation with TBP.…”

“…The effect of TBP, dodecane, and nitric acid on the distribution of TBP between the two phases in the presence of inextractable metal nitrates like sodium nitrate and calcium nitrate has been studied, and the results obtained are compared with those obtained previously by Bajoria et al in the absence of any metal nitrates. 17 It has been observed from Figures 2−4 that the distribution coefficient K d of TBP increases with the increase in TBP concentration from (0.019 to 17.445) mol•kg −1 in the organic phase. The results obtained are in concordance with that reported by Bajoria et al 17 K d of TBP is the ratio of concentration of TBP in the organic phase to that in the aqueous phase.…”

Extraction Studies of Phosphoric Acid Tributyl Ester from Nitric Acid Solutions Using Dodecane in the Presence of Inextractable Metal Nitrates

“…It has been found that the extraction of nitric acid by TBP increases with the concentration of nitric acid in the aqueous phase and hence distribution coefficient K d of nitric acid increases. The result obtained is in agreement with that reported by Bajoria et al…”

“…It has been observed from Figures – that the distribution coefficient K d of TBP increases with the increase in TBP concentration from (0.019 to 17.445) mol·kg –1 in the organic phase. The results obtained are in concordance with that reported by Bajoria et al K d of TBP is the ratio of concentration of TBP in the organic phase to that in the aqueous phase. As the concentration of TBP increases in the organic phase, a greater amount of TBP is transferred into the aqueous phase and distribution coefficient K d of TBP increases.…”

“…The distribution coefficient values K d obtained for nitric acid have been compared with the previously obtained distribution coefficient values of nitric acid in the absence of metal nitrates . The results obtained reveal that the transfer of nitric acid into the organic phase increases and thus distribution coefficient values increase with the presence of these inextractable metal nitrates in the aqueous phase.…”

“…The result obtained is in agreement with that reported by Bajoria et al 17 The distribution coefficient values K d obtained for nitric acid have been compared with the previously obtained distribution coefficient values of nitric acid in the absence of metal nitrates. 17 The results obtained reveal that the transfer of nitric acid into the organic phase increases and thus distribution coefficient values increase with the presence of these inextractable metal nitrates in the aqueous phase. Sodium nitrate and calcium nitrate are inextractable metal nitrates, and their presence in the aqueous phase along with nitric acid eliminates any competition for complex formation with TBP.…”

“…The effect of TBP, dodecane, and nitric acid on the distribution of TBP between the two phases in the presence of inextractable metal nitrates like sodium nitrate and calcium nitrate has been studied, and the results obtained are compared with those obtained previously by Bajoria et al in the absence of any metal nitrates. 17 It has been observed from Figures 2−4 that the distribution coefficient K d of TBP increases with the increase in TBP concentration from (0.019 to 17.445) mol•kg −1 in the organic phase. The results obtained are in concordance with that reported by Bajoria et al 17 K d of TBP is the ratio of concentration of TBP in the organic phase to that in the aqueous phase.…”

Extraction Studies of Phosphoric Acid Tributyl Ester from Nitric Acid Solutions Using Dodecane in the Presence of Inextractable Metal Nitrates

“…It has been found that the extraction of nitric acid by TBP increases with the concentration of nitric acid in the aqueous phase and hence distribution coefficient K d of nitric acid increases. The result obtained is in agreement with that reported by Bajoria et al…”

“…It has been observed from Figures – that the distribution coefficient K d of TBP increases with the increase in TBP concentration from (0.019 to 17.445) mol·kg –1 in the organic phase. The results obtained are in concordance with that reported by Bajoria et al K d of TBP is the ratio of concentration of TBP in the organic phase to that in the aqueous phase. As the concentration of TBP increases in the organic phase, a greater amount of TBP is transferred into the aqueous phase and distribution coefficient K d of TBP increases.…”

“…The distribution coefficient values K d obtained for nitric acid have been compared with the previously obtained distribution coefficient values of nitric acid in the absence of metal nitrates . The results obtained reveal that the transfer of nitric acid into the organic phase increases and thus distribution coefficient values increase with the presence of these inextractable metal nitrates in the aqueous phase.…”

“…The result obtained is in agreement with that reported by Bajoria et al 17 The distribution coefficient values K d obtained for nitric acid have been compared with the previously obtained distribution coefficient values of nitric acid in the absence of metal nitrates. 17 The results obtained reveal that the transfer of nitric acid into the organic phase increases and thus distribution coefficient values increase with the presence of these inextractable metal nitrates in the aqueous phase. Sodium nitrate and calcium nitrate are inextractable metal nitrates, and their presence in the aqueous phase along with nitric acid eliminates any competition for complex formation with TBP.…”

“…The effect of TBP, dodecane, and nitric acid on the distribution of TBP between the two phases in the presence of inextractable metal nitrates like sodium nitrate and calcium nitrate has been studied, and the results obtained are compared with those obtained previously by Bajoria et al in the absence of any metal nitrates. 17 It has been observed from Figures 2−4 that the distribution coefficient K d of TBP increases with the increase in TBP concentration from (0.019 to 17.445) mol•kg −1 in the organic phase. The results obtained are in concordance with that reported by Bajoria et al 17 K d of TBP is the ratio of concentration of TBP in the organic phase to that in the aqueous phase.…”

Extraction Studies of Phosphoric Acid Tributyl Ester from Nitric Acid Solutions Using Dodecane in the Presence of Inextractable Metal Nitrates

“…It has been found that the extraction of nitric acid by TBP increases with the concentration of nitric acid in the aqueous phase and hence distribution coefficient K d of nitric acid increases. The result obtained is in agreement with that reported by Bajoria et al…”

“…It has been observed from Figures – that the distribution coefficient K d of TBP increases with the increase in TBP concentration from (0.019 to 17.445) mol·kg –1 in the organic phase. The results obtained are in concordance with that reported by Bajoria et al K d of TBP is the ratio of concentration of TBP in the organic phase to that in the aqueous phase. As the concentration of TBP increases in the organic phase, a greater amount of TBP is transferred into the aqueous phase and distribution coefficient K d of TBP increases.…”

“…The distribution coefficient values K d obtained for nitric acid have been compared with the previously obtained distribution coefficient values of nitric acid in the absence of metal nitrates . The results obtained reveal that the transfer of nitric acid into the organic phase increases and thus distribution coefficient values increase with the presence of these inextractable metal nitrates in the aqueous phase.…”

“…The result obtained is in agreement with that reported by Bajoria et al 17 The distribution coefficient values K d obtained for nitric acid have been compared with the previously obtained distribution coefficient values of nitric acid in the absence of metal nitrates. 17 The results obtained reveal that the transfer of nitric acid into the organic phase increases and thus distribution coefficient values increase with the presence of these inextractable metal nitrates in the aqueous phase. Sodium nitrate and calcium nitrate are inextractable metal nitrates, and their presence in the aqueous phase along with nitric acid eliminates any competition for complex formation with TBP.…”

“…The effect of TBP, dodecane, and nitric acid on the distribution of TBP between the two phases in the presence of inextractable metal nitrates like sodium nitrate and calcium nitrate has been studied, and the results obtained are compared with those obtained previously by Bajoria et al in the absence of any metal nitrates. 17 It has been observed from Figures 2−4 that the distribution coefficient K d of TBP increases with the increase in TBP concentration from (0.019 to 17.445) mol•kg −1 in the organic phase. The results obtained are in concordance with that reported by Bajoria et al 17 K d of TBP is the ratio of concentration of TBP in the organic phase to that in the aqueous phase.…”