The extraction of mineral acids by tri-n-butyl phosphate (TBP)

Hesford, E.; McKay, H.A.C.

doi:10.1016/0022-1902(60)80248-5

Cited by 103 publications

(25 citation statements)

References 8 publications

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“…Since HTC0 4 is a strong acid [15], it might be expected to behave like other strong acids, especially strong oxyacids, when interacting with TBP. However, while there is evidence for 1 : 2 and 2 : 1 TBP : HA complexes containing varying numbers of H 2 0 molecules [16,17], most of the acids that have been studied form 1 : 1 complexes with TBP under most conditions. A solvation number of three appears to be most unusual.…”

Section: Fig 4 Dj C As a Function Of Tbp Concentrationmentioning

confidence: 99%

The Solvent Extraction Behavior of Technetium

Pruett

1981

Radiochimica Acta

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The solvent extraction of heptavalent technetium from aqueous nitric acid by tri-n-butyl phosphate (TBP) has been studied over a wide range of TBP and HN0 3 concentrations at 25, 40, and 60° C. The extraction was found to proceed according to the reaction 3TBP+ H + + TcO, ^ [HTcO"· 3 TBP|. A discussion of possible extraction mechanisms is presented, along with values of AG, AH, AS, and Κ for the extraction reaction.

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Section: Fig 4 Dj C As a Function Of Tbp Concentrationmentioning

confidence: 99%

The Solvent Extraction Behavior of Technetium

Pruett

1981

Radiochimica Acta

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“…The possibility of coextraction of hydrochloric acid by tri-n-butyl phosphate to the organic phase, can be neglected in the concentration range studied [10]. According to Naïto and Suzuki [10] and Hesford and McKay [11] the sequence of extractability of proton acids for mineral acids by TBP is: HF = HClO 4 > HNO 3 > H 3 PO 4 > HCl > H 2 SO 4 . This was confirmed by the chloride ion analysis, of the aqueous phase, using Volhard's method.…”

Section: Introductionmentioning

confidence: 97%

Liquid–liquid equilibria in the system H3PO4–KCl–H2O–tri-n-butyl phosphate: experiments and modelling

Ziat

Messnaoui

Bounahmidi

et al. 2004

Fluid Phase Equilibria

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“…Previous studies, however, have shown that water extraction does not play a major role in TBP-HNO 3 systems. [23,24] …”

Section: Determination Of Sample Compositionsmentioning

confidence: 99%

Small‐Angle Neutron Scattering Study of Plutonium Third Phase Formation in 30% TBP/HNO₃/Alkane Diluent Systems

Plaue¹,

Gelis

Czerwinski

et al. 2006

Solvent Extraction and Ion Exchange

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Third phase formation in the extraction of Pu(IV) nitrate by 30% tri-n-butyl phosphate (TBP) dissolved in n-dodecane or in the highly branched diluent hydrogenated polypropylene tetramer (HPT), which may also be known as 4,4 dipropyl 283 heptane or tétrapropylène hydrogéné, was investigated through small-angle neutron scattering (SANS) measurements. The SANS data were interpreted using the Baxter model for hard-spheres with surface adhesion. According to this model, the increase in scattering intensity observed when increasing amounts of Pu(NO 3 ) 4 are extracted into the organic phase, is due to interactions between small reverse micelles containing three to five TBP molecules. In n-dodecane, the micelles interact through attractive forces between their polar cores with a potential energy of up to 22.6 k B T. This strong intermicellar attraction leads to organic phase splitting with the separation of most of the solutes of the original organic phase into a distinct phase containing interspersed layers of n-dodecane. When HPT is the diluent, the intermicellar attraction energy calculated from the SANS data is much lower, and no third phase formation is observed under comparable chemical conditions. However, when a significant amount of the initial aqueous plutonium is in the form of plutonyl ions, PuO 2 2þ , the critical energy potential is reached even in HPT. A potential explanation of the effect of Pu(VI) involves the formation of a plutonyl trinitrato complex.

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The extraction of mineral acids by tri-n-butyl phosphate (TBP)

Cited by 103 publications

References 8 publications

The Solvent Extraction Behavior of Technetium

The Solvent Extraction Behavior of Technetium

Liquid–liquid equilibria in the system H3PO4–KCl–H2O–tri-n-butyl phosphate: experiments and modelling

Small‐Angle Neutron Scattering Study of Plutonium Third Phase Formation in 30% TBP/HNO₃/Alkane Diluent Systems

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The extraction of mineral acids by tri-n-butyl phosphate (TBP)

Cited by 103 publications

References 8 publications

The Solvent Extraction Behavior of Technetium

The Solvent Extraction Behavior of Technetium

Liquid–liquid equilibria in the system H3PO4–KCl–H2O–tri-n-butyl phosphate: experiments and modelling

Small‐Angle Neutron Scattering Study of Plutonium Third Phase Formation in 30% TBP/HNO3/Alkane Diluent Systems

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Small‐Angle Neutron Scattering Study of Plutonium Third Phase Formation in 30% TBP/HNO₃/Alkane Diluent Systems