Solvent extraction of scandium, yttrium and lanthanum by the monoalkyl orthophosphoric acids

Warren, C.G.; Suttle, John F.

doi:10.1016/0022-1902(60)80380-6

Cited by 24 publications

(7 citation statements)

References 5 publications

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“…The monoalkyl and dialkyl phosphates have been studied by many workers (119,120,300,423,425,428,429,440,499,607). The extracting agents studied include dibutyl phosphate (119, 120, 300, The extraction of lanthanides with dialkylphosphoric acids shows an inverse third-order dependence on hydrogen ion concentration and a direct third-order dependence on the concentration of the extracting agent.…”

Section: Extraction With Acidic Phosphate Estersmentioning

confidence: 99%

“…Extraction with monoalkylphosphoric acids has been investigated, but the mechanism of extraction is not well understood. Both a chelate and a "polymer" extraction mechanism have been proposed (425,607).…”

Section: Extraction With Acidic Phosphate Estersmentioning

confidence: 99%

“…Distribution coefficients for scandium and yttrium ion for tri-n-butyl phosphate are, respectively, 0.04 and <0.001 for a 3.0 M aqueous hydrochloric acid phase and 50 and 0.05 for an 8.0 M hydrochloric acid phase (430). The extraction of the ions Sc3+, Y3+, and La3+ into amyl alcohol solutions of monoalkylphosphoric acids (H2RP04, where R = propyl, butyl, amyl, hexyl, octyl) from aqueous nitric acid solutions suggests (Table IX) formation of the species Sc(HRP04)3, HY(HRP04)4, and HLa(HRP04)4 (607). Scandium nitrate solutions, unlike those of yttrium and the rare earth metal nitrates, can be extracted with diethyl ether (53).…”

Section: Solvent Extractionmentioning

confidence: 99%

See 2 more Smart Citations

The Coordination Chemistry of Yttrium and the Rare Earth Metal Ions

Moeller¹,

Martin²,

Thompson³

et al. 1965

Chem. Rev.

415

118

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Section: Extraction With Acidic Phosphate Estersmentioning

confidence: 99%

Section: Extraction With Acidic Phosphate Estersmentioning

confidence: 99%

Section: Solvent Extractionmentioning

confidence: 99%

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The Coordination Chemistry of Yttrium and the Rare Earth Metal Ions

Moeller¹,

Martin²,

Thompson³

et al. 1965

Chem. Rev.

415

118

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“…The NMR data indicated that the p K a values were close, but slightly higher. Neutralization of n -pentyl dihydrogen phosphates in dilute aqueous solution by titration was reportedly complete at pH values of 4.5 and 9.5 . Both studies, but using different measures, indicated that the acid strength of the two hydrogens in alkyl dihydrogen phosphate is higher than the acid strength in the dihydrogen phosphate anion (H 2 PO 4 – ).…”

Section: Discussionmentioning

confidence: 99%

“…Neutralization of n-pentyl dihydrogen phosphates in dilute aqueous solution by titration was reportedly complete at pH values of 4.5 and 9.5. 29 Both studies, but using different measures, indicated that the acid strength of the two hydrogens in alkyl dihydrogen phosphate is higher than the acid strength in the dihydrogen phosphate anion (H 2 PO 4 − ). Alkyl phosphoric acid esters are therefore still acidic, and the implication is that reaction with another olefin could proceed in the same way to form a dialkyl phosphoric acid ester.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Reaction of Pentenes, Hexenes, and Heptenes with Phosphoric Acid

2019

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A temperature swing absorption process using phosphoric acid was proposed for the removal of olefins from cracked naphtha. Evaluation of this required information on the reaction of naphtha range olefins with phosphoric acid. Reactive absorption of olefins at 50 °C in 85% phosphoric acid (H3PO4) was studied. The olefins evaluated were 1-pentene, 2-methyl-1-butene, 2-methyl-2-butene, cyclopentene, 1-hexene, 2-methyl-1-pentene, cyclohexene, 1-heptene, 2-methyl-1-hexene, and 4-methylcyclohexene. All of the olefins formed alkyl phosphoric acid esters, with C n olefins forming C n -, C2n -, and sometimes C3n -alkyl phosphoric acid esters. Branching in the olefin affected alkyl phosphoric acid ester stability; ester bonds to the α-carbon were more stable. The acyclic C5-alkyl phosphoric acid esters were more water soluble than oil soluble, and as the chain length of the alkyl group increased, oil solubility increased. Cyclohexyl and methyl cyclohexyl phosphoric acid esters formed stable water–oil emulsions. Reaction rates were low, but double bond isomerization took place and proceeded stepwise, with alkyl phosphoric acid esters being intermediate products rather than reaction intermediates. Although it was found that temperature swing absorption using phosphoric acid would not result in a viable process, the study provided several insights about the intermediate products and phase behavior of phosphoric acid catalyzed olefin conversion.

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Flüssige Ionenaustauscher — I. Wesen und Anwendung

Häupke¹,

Wolf²

1964

Zeitschrift fuer Chemie

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Die Bezeichnung „flüssige Ionenaustauscher”︁ hat sich in letzter Zeit für eine Gruppe ionenselektiver Extraktionsmittel eingeführt, die aus Lösungen von nicht wasserlöslichen ionogenen Verbindungen (langkettigen sauren Phosphorsäureestern oder langkettigen Aminen) in mit Wasser nicht mischbaren Lösungsmitteln be‐stehen. Sie eignen sich speziell zur Extraktion von Metallen zum Zweck der Gewinnung, Reinigung oder Trennung auf nassem Wege. Es wird ein Überblick über die bekanntgewordenen flüssigen Ionenaustauscher, ihre Anwendung und ihre Wirkungsweise gegeben.

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Solvent extraction of scandium, yttrium and lanthanum by the monoalkyl orthophosphoric acids

Cited by 24 publications

References 5 publications

The Coordination Chemistry of Yttrium and the Rare Earth Metal Ions

The Coordination Chemistry of Yttrium and the Rare Earth Metal Ions

Reaction of Pentenes, Hexenes, and Heptenes with Phosphoric Acid

Flüssige Ionenaustauscher — I. Wesen und Anwendung

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