Praseodymium nitrate and neodymium nitrate complexation with organophosphorus reagents in supercritical carbon dioxide solvent

Fox, Robert V.; Ball, R. D.; Harrington, Peter de B.; Rollins, Harry W.; Jolley, John; Wai, Chien M.

doi:10.1016/j.supflu.2003.11.006

Cited by 28 publications

(29 citation statements)

References 35 publications

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“…Analysis of the infrared spectra led to the conclusion that ionic nitrate was present. A study of the complex formation of Nd(NO 3 ) 3 with various organophosphorus reagents in supercritical CO 2 concluded on the basis of electronic spectroscopy that [Nd(NO 3 ) 3 ( n Bu 3 PO) 5 ] was formed, but no materials were isolated and further characterisation was not given [20]. Trioctylphosphine oxide has been used as an extractant for Nd 3+ in the presence of dinonylphenylphosphoric acid in nitric acid [21].…”

Section: Complexes With Lanthanide Nitratesmentioning

confidence: 99%

Lanthanide phosphine oxide complexes

Platt

2017

Coordination Chemistry Reviews

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Phosphine oxide complexes of lanthanide metal have been studied to elucidate the fundamental aspects of their structural chemistry and to develop important technological applications mainly in the reprocessing of nuclear fuels and in photoluminescent devices but also in other fields such as gas sorption and homogeneous catalysis. The aim of this review is to give an overview of the range of complexes with phosphine oxides and trivalent lanthanide and yttrium ions, their structural features and applications.

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Section: Complexes With Lanthanide Nitratesmentioning

confidence: 99%

Lanthanide phosphine oxide complexes

Platt

2017

Coordination Chemistry Reviews

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“…29 Note that the 1:3 lanthanide−TBP complex is less soluble in sc-CO 2 than the 1:4 complex. 24,25 The solubilities of metal−TBP complexes in sc-CO 2 directly impact their extraction efficacies. …”

Section: Resultsmentioning

confidence: 99%

Extraction of Rare Earth Oxides Using Supercritical Carbon Dioxide Modified with Tri-n-Butyl Phosphate–Nitric Acid Adducts

Baek

Fox

Case

et al. 2016

Ind. Eng. Chem. Res.

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A new tri-n-butylphosphate−nitric acid (TBP−HNO 3 ) adduct was prepared by combining TBP and fuming (90%) HNO 3 . The adduct was characterized, and its phase-equilibrium behavior in supercritical carbon dioxide is reported. Supercritical carbon dioxide (sc-CO 2 ) was modified with this new adduct [TBP(HNO 3 ) 5.2 (H 2 O) 1.7 ], and the extraction efficacies of selected rare earth oxides (Y, Ce, Eu, Tb, and Dy) at 338 K and 34.5 MPa were compared with those obtained using an adduct formed from concentrated (70%) HNO 3 and TBP [TBP(HNO 3 ) 1.7 (H 2 O) 0.6 ]. All rare earth oxides tested with both adduct species could be extracted with the exception of cerium oxide. The water and acid concentrations in the different adducts were found to play a significant role in rare earth oxide extraction efficiency.

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“…A variety of ligands such as dithiocarbamates [7,8], beta diketones [7,[9][10][11], organophosphorous reagents [12] such as TBP and TOPO, and macrocyclic compounds e.g. crown ethers [13][14][15] are used for SFE of various metal ions such as transition elements [9,16,17], lanthanides [18][19][20][21] and actinides [20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…In the in-situ mode, the ligand is added to the metal ion in the extraction vessel and is subjected to Sc-CO 2 extraction [7,9,18]. The metal ion in the sample matrix is maintained in equilibrium with the ligand in a static condition for about 15-30 min and subsequently extracted through a dynamic pumping of Sc-CO 2 continuously to collect the extracted species.…”

Section: Introductionmentioning

confidence: 99%

“…a static equilibration period enabling an in-situ chelation/complexation of the metal ions followed by dynamic extraction for a period of an appropriate duration depending upon the species of interest and nature of sample matrix. In-situ chelation method was employed in various SFE studies, including extraction of metal ions such as transition metal ions [9] and lanthanides [18,19].…”

Section: Introductionmentioning

confidence: 99%

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A novel technique for modifier free delivery of ligands for supercritical fluid extraction

Kumar

Sivaraman²,

Sujatha

et al. 2009

Radiochimica Acta

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Supercritical fluid extraction / Ligand delivery profile / CMPO / D2EHIBA / TOPO / TBP Summary.A novel method has been developed for the controlled delivery of various ligands including solid extractants using supercritical carbon dioxide (Sc-CO 2 ). A ligand delivery vessel with a restricted geometry where its inlet and outlet are located beside each other, accomplished the task of the controlled delivery of ligands. The proposed method eliminates the usage of modifier solvent such as methanol for the delivery of various ligands during the supercritical fluid extraction of metal ions. Using neat Sc-CO 2 , the delivery profiles for the various ligands such as octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphineoxide (CMPO), tri-n-butyl phosphate (TBP), tri-n-octyl phosphine oxide (TOPO), theonyltrifluroacetone (TTA) and di(2-ethylhexyl)isobutyramide (D2EHIBA) were established. The delivery profiles were optimised by investigating the influence of various extraction parameters such as ligand delivery vessel geometry, temperature, pressure, flow rate of Sc-CO 2 and ligand content. Applications of these ligand delivery modes were demonstrated for the supercritical fluid extraction of uranium from tissue paper matrix and preferential extraction of uranium over thorium. These results are compared with the extraction studies involving methanol or hexane modifier under similar experimental conditions. The extraction of neodymium nitrate was also demonstrated using modifier free delivery mode.

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Praseodymium nitrate and neodymium nitrate complexation with organophosphorus reagents in supercritical carbon dioxide solvent

Cited by 28 publications

References 35 publications

Lanthanide phosphine oxide complexes

Lanthanide phosphine oxide complexes

Extraction of Rare Earth Oxides Using Supercritical Carbon Dioxide Modified with Tri-n-Butyl Phosphate–Nitric Acid Adducts

A novel technique for modifier free delivery of ligands for supercritical fluid extraction

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