Tri-n-butylphosphate, TBP

M. Baaden, R. Schurhammer, and G. Wipff. Molecular dynamics study of the uranyl extraction by tri-n-butylphosphate (TBP) Demixing of water/oil/TBP solutions with a comparison of supercritical C02 and chloroform. J. Phys. Chem. B, 106(2) 434-441, 2002. 

Baaden, M., Schurhammer, R., Wipff, G. (2002), Molecular Dynamics Study of the Uranyl Extraction by Tri-n-butylphosphate (TBP) Demixing of Water/"Oil"/TBP Solutions with a Comparison of Supercritical CO2 and Chloroform, J. Phys. Chem. B 106, 434-441. 

We have used tri-n-octylphosphine oxide (TOPO) as a solvent extractant of uranium(VI) and thorium(IV) from nitric and hydrochloric acid solutions (1-3). In contrast, the extraction of uranium(VI) and thorium(IV) from nitric and hydrochloric acid solutions has been investigated by tri-n-butylphosphate (TBP) (4, 5). However, since TBP reveals a poor efficiency for the extraction of metals from sulphuric acid solutions, this paper extends the work to the extraction of uranium(VI) from sulphuric acid solutions by TOPO. 

N-Methylpyrrolidone, NMP b) Triethylphosphate b) Tri-n-butylphosphate, TBP b) Tri-iso-butylphosphate b) Tris(2-chloroethyl)phosphate, TCEPb) Tris(chloropropyl)phosphates (2 isomers), TCPPb) Tris(butoxyethoxy)phosphatesb) Dimethylphthalate b)... 

Neutral extractants may be used for uncharged metal complexes, ionic salts, and strong acids. Examples include ethers such as diethylether and diisopropylether ketones such as methylisobutyl ketone (MIBK or hexone) and neutral organophosphorous compounds such as tri-n-butylphosphate (TBP), tri-n-octylphosphine oxide (TOPO), triphenylphosphate (TPP), and triphenyphosphine oxide (TPPO). Such neutral extractants have long been used for extracting actinides and lanthanides from nitric acid solutions. 

Tri-n-butylphosphate (TBP), (C HgO)gPO, will serve as the typical compound of this type. A complete survey of the literature on TBP extraction of Pu is beyond the scope of this review. The more recent papers will be emphasized,... 

Several early attempts at the creation of a PIM system for the transport and separation of U from aqueous solutions were based around the use of the extractant tri-n-butylphosphate (TBP). The first of these was reported by Bloch and co-workers, who described a system in which a membrane was fabricated using a mixture of 75 wt% TBP and 25 wt% CTA (Bloch etal, 1967). Given data from later systems, this is a very high concentration of extractant this PIM was not properly self-supporting and generally had to be supported on Kraft paper. Although the membrane showed poor stability, it successfully extracted U from nitric acid solutions. 

Visser et al. [41] studied uranyl extraction with CMPO (carbamoylmeth)4phos-phine oxide) and TBP (tri-n-butylphosphate) into [BMIM][PFe] and [OMIM][Tf2N] (TfjN = bis(trifiuoromethanesulfonyl)imide) firom aqueous acidic media and also showed enhancement for uranyl ion extraction into ILs when compared to dode-cane. Extended X-ray absorption fine structure (EXAFS) measurements (Fig. 3.3-2) and UV/vis spectroscopy (Fig. 3.3-3) showed that uranyl-CMPO complexes in [BMIM][PFe] and [OMIM](Tf2N] are similar, but different firom those in dodecane. 

FIGURE 11.6 Plot of alpha values for protonated monomers of organophosphate compounds obtained at two fields of 80 (bottom) and 140 (top) Td as a function of moisture. DMMP, dimethyl-methylphosphonate TMP, trimethyl-phosphate DEMP, diethyl-methyl-phosphonate DEEP, diethyl-ethylphosphonate DIMP, di-iso-prophyl-methylphosphonate DEIP, diethyl-iso-prophylphosphonate TEP, triethyl phosphate TPP, tripropyl phosphate DBBP, dibutyl-butylphosphonate TBP, tri-n-butylphosphate. (From Krylova et al., Effect of moisture on high field dependence of mobility for gas phase ions at atmospheric pressure organophosphorus compounds, J. Phys. Chem. 2003. With permission.)... 

Solovkin, A.S. and Zakharov, Y.N. (1980) Application of an extraction method with n-tri-butylphosphate (TBP) for determination of a mechanism and thermodynamic constant of complexation of plutonium(lV) with acetic acid in nitric acid aqueous solution. Radiokhimiya, 2, 225—230. 

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