The system: Tri-n-butyl phosphate (TBP)-nitric acid-water—I activities of TBP in equilibrium with aqueous nitric acid and partial molar volumes of the three components in the TBP phase

Davis, W.; Mrochek, J.E.; Hardy, Christopher J.

doi:10.1016/0022-1902(66)80292-0

Cited by 45 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An average TBP aggregation number was calculated from the average aggregate volume, the chemical compositions of the samples, and the molecular volumes of the system components. The molecular volumes of TBP, HNO 3 , and H 2 O used were 273.87, 43.26, and 18.02 cm 3 /mol, respectively. , Because the molecular volume of Zr(NO 3 ) 4 has not been determined, the known molecular volume of ZrCl 4 (83.14 cm 3 /mol) was used as a reasonable estimate . The molecular volume of UO 2 (NO 3 ) 2 used was 70.70 cm 3 /mol .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The molecular volumes of TBP, HNO 3 , and H 2 O used were 273.87, 43.26, and 18.02 cm 3 /mol, respectively. 15,46 Because the molecular volume of Zr(NO 3 ) 4 has not been determined, the known molecular volume of ZrCl 4 (83.14 cm 3 /mol) was used as a reasonable estimate. 17 The molecular volume of UO 2 (NO 3 ) 2 used was 70.70 cm 3 / mol.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Tributyl Phosphate Aggregation in the Presence of Metals: An Assessment Using Diffusion NMR Spectroscopy

et al. 2016

View full text Add to dashboard Cite

Diffusion nuclear magnetic resonance (NMR) spectroscopy was used to find the interaggregate interactions and sizes of tributyl phosphate (TBP) aggregates containing varying concentrations of uranium or zirconium and HNO in an n-dodecane diluent. The average diffusion coefficients of TBP species were measured using a pulsed-field gradient stimulated echo experiment with a longitudinal eddy-current delay (STE-LED). Interaggregate interactions were determined by measuring the diffusion coefficient of TBP in a sample after a series of dilutions with n-dodecane. The interaction-independent infinite dilution diffusion coefficient was also calculated from these measurements. The sizes of TBP aggregates were calculated from the infinite dilution diffusion coefficient using the Wilke-Chang equation. Interactions between TBP aggregates were observed to correspond to a hard sphere potential with a repulsive component. Aggregate sizes found by NMR were comparable to literature values found using small-angle neutron scattering. The diffusion of TBP in heavy organic third phases indicates that the third phase may be a bicontinuous structure like that found in traditional surfactant systems.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Tributyl Phosphate Aggregation in the Presence of Metals: An Assessment Using Diffusion NMR Spectroscopy

et al. 2016

View full text Add to dashboard Cite

show abstract

“…WSRC-TR-98-00171 Revision 1 and (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) The boundary conditions at the TBP-aqueous interface (at z = H ) are given by (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) At the start of the calculation, it is assumed that both the temperature and the composition are uniform throughout the TBP layer. It is assumed that the composition is at the same saturation level specified for the interface.…”

Section: Wsrc-tr-98-00171mentioning

confidence: 99%

Analysis of Steam Heating of a Two-Layer TBP/N-Paraffin/Nitric Acid Mixtures

Laurinat¹,

Hassan²,

Rudisill³

et al. 1998

View full text Add to dashboard Cite

“…It is known that data on phase equilibria in these systems is very important for modeling the extraction separation of rare earth elements in a nitric acid medium with tributyl phosphate. Phase equilibria and thermodynamic properties in the subsystems H 2 O–HNO 3 , H 2 O–TBP, H 2 O–HNO 3 –TBP, H 2 O–Eu(NO 3 ) 3 , − H 2 O–Gd(NO 3 ) 3 , − H 2 O–HNO 3 –Eu(NO 3 ) 3 , and H 2 O–HNO 3 –Gd(NO 3 ) 3 are well studied. Although liquid–liquid equilibria in the H 2 O–HNO 3 –Ln(NO 3 ) 3 –TBP (Ln = Eu, Gd) systems were investigated, the data are insufficient. − In some studies, authors used trace concentrations of REEs. − In other studies, authors investigated a wide range of concentrations of nitric acid and rare earth elements but did not present the total compositions of the systems. − Thus, these data cannot be used to construct the rigorous thermodynamic model.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Equilibria in the Water–Nitric Acid–Europium Nitrate–Gadolinium Nitrate–Tributyl Phosphate System at 298.15 K

et al. 2021

View full text Add to dashboard Cite

Liquid–liquid equilibria in the H2O–HNO3–Eu(NO3)3–Gd(NO3)3–tributyl phosphate (TBP) system and in two H2O–HNO3–Ln(NO3)3–TBP (Ln = Eu, Gd) subsystems have been investigated at 298.15 K in a wide range of nitric acid and rare earth elements (REEs) concentrations. The total compositions of the extraction systems and the content of REEs and nitric acid in equilibrium phases are presented. Densities of solutions in two subsystems have been measured. The distribution coefficients of REEs and nitric acid and the separation factor of REEs in equilibrium phases have been determined. The obtained experimental data can be further used for thermodynamic modeling of systems that are promising for the extraction separation of REEs.

show abstract

The system: Tri-n-butyl phosphate (TBP)-nitric acid-water—I activities of TBP in equilibrium with aqueous nitric acid and partial molar volumes of the three components in the TBP phase

Cited by 45 publications

References 8 publications

Tributyl Phosphate Aggregation in the Presence of Metals: An Assessment Using Diffusion NMR Spectroscopy

Tributyl Phosphate Aggregation in the Presence of Metals: An Assessment Using Diffusion NMR Spectroscopy

Analysis of Steam Heating of a Two-Layer TBP/N-Paraffin/Nitric Acid Mixtures

Liquid–Liquid Equilibria in the Water–Nitric Acid–Europium Nitrate–Gadolinium Nitrate–Tributyl Phosphate System at 298.15 K

Contact Info

Product

Resources

About