The The Separation of Thorium and Rare Earth Salts by Solvent Extraction.

Asselin, G.F.; Audrieth, L. F.; Comings, E. W.

doi:10.1021/j150479a006

Cited by 22 publications

(16 citation statements)

References 4 publications

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“…They also indicate that ammonium thiocyanate,although increasing mass transfer to the organic^ does not affect the gadolinium-yttrluBi separation factor. These generalities were reported by other investigators (43,40) employing alcohols as the organic phase.…”

Section: Isc-695supporting

confidence: 86%

“…It is apparent from these data that the nitrate system is much more effective than the chloride system for the separation ISC-695 of yttrium from gadolinium. This generality has been reported by other investigators (43,40) while employing alcohols, esters, ketones, ethers and hydrocarbons as the organic phase and extracting mixtures of lanthanum and neodymlum (40) and neodymium and erbium (43).…”

Section: Isc-695supporting

confidence: 77%

“…However^ for a corresponding rare earth nitrate system^four times more material was transferred to this alcohol organic phase with increased separation factors. The presence of ammonium thiocyanate in the chloride or nitrate lanthanlde system yielded slightly more transfer but with no appreciable change in their separation factors (43).…”

Section: General History Of Rare Earth Separationmentioning

confidence: 92%

“…A further investigation on a nitratealcohol system by Templeton (42) indicated a regular increase in extraction with atomic number for all the rare earths from lanthanum to samarium^inclusive. Studies on the extraction of an aqueous solution of neodymium and erbium chlorides with n-butanol indicated little transfer to the organic phase and no detectable separation (43). However^ for a corresponding rare earth nitrate system^four times more material was transferred to this alcohol organic phase with increased separation factors.…”

Section: General History Of Rare Earth Separationmentioning

confidence: 99%

“…Addition of oxalic acid then insured quantitative and rapid precipitation. Asselln, Audrieth and Comings (43) concluded that either ammonium hydroxide or oxalic acid gives a quantitative precipitation of rare earths from aqueous acidic solutions. The oxalate precipitate is slightly granular and consequently can be filtered and washed much easier than the gelatinous yttrium and rare earth hydroxides.…”

Section: Isc-695mentioning

confidence: 99%

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Separations of Yttrium and Some Rare Earths by Liquid-Liquid Extraction

Foos¹,

Wilhelm²

1954

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This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, express or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in this report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the Commission" includes any employee .or contractor of the Commission to the extent that such employee or contractor prepares, handles or distributes, or provides access to, any information pursuant to his employment or contract with the Commission. This report has been reproduced directly from the best available copy.

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Section: Isc-695supporting

confidence: 86%

Section: Isc-695supporting

confidence: 77%

Section: General History Of Rare Earth Separationmentioning

confidence: 92%

Section: General History Of Rare Earth Separationmentioning

confidence: 99%

Section: Isc-695mentioning

confidence: 99%

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Separations of Yttrium and Some Rare Earths by Liquid-Liquid Extraction

Foos¹,

Wilhelm²

1954

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Über die Trennung der Seltenen Erden durch Verteilen zwischen zwei Lösungsmitteln

Fischer¹,

Braune²,

Dietz³

et al. 1954

Angewandte Chemie

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Die Bedeutung der Zwischenstufen des Cyclus fiirsynthesen Wenn wir annehmen, da6 in einigen Zellarten der Cyclus nicht der Hauptmechanismus ist, durch den Energie erzeugt wird, aber die Enzymsysteme, die fiir Teilreaktionen des Cyclus verantwortlich sind, trotzdem vorliegen, dann ergibt sich die Frage, welche physiologische Bedeutung dem Cyclus in diesen Materialien zukommt. I m Hinblick auf dieses Problem ist bedeutungsvoll, da6 es zusatzlich zu den energieliefernden Mechanismen eine andere wichtige Gruppe von chemischen Reaktionen in schnell wachsenden Organismen gibt: die s y n t h e t i s c h e n P r o z e s s e , die rnit dem Wachstum verkniipft sind.Beziiglich des Kohlenstoff-Umsatzes konnen beide Reaktionstypen von derselben GrSBenordnung sein. Die Reaktionen des Cyclus stellen ein wichtiges Zwischenprodukt fur eine Anzahl von Synthesen zur Verfiigung, namlich a-Yetoglutarsiure, die eine Vorstufe fur Glutaminsaure und andere Aminosauren ist, sowie fur die Porphyrine, die fur die Synthese der Cytochrome und der Blutpigmente gebraucht werden. Viele Beobachtungense), insbesondere Isotopenversuche, stiitzen die Ansicht, da6 bei einigen Mikroorganismen der Cyclus prim& eher ftir die Lieferung von lntermediarprodukten verantwortlich ist, als fur die Energieerzeugung, wahrend er bei den Tieren und vielen anderen Organismen beides liefert, E n e r g i e u n d I n t e rm e d i a r p r o d u k t e . Gemeinsame biochemische Eigenschaften venchiedener LebensformenBevor ich schliebe, mochte ich einen Abstecher in die allgemeine Biologie machen, angeregt durch die bemerkens-A q e w . Ckern. 66. Jalwg. 1951 J N r . 12 * d V .Unter der Annahme, da9 der Verteilungskoeffizient a = l c~ : l c~ unter den Versuchsbedingungen konstant bleibt, folgt durch Integration, wenn unter :CS die Ausgangskonzentration in der sohweren Phase verstanden wird: a . V . 1cS:iCS.e vs aa) Vgl. M . W . Kies u. P . L. Davis J. biol. Chemistry 789, 637 [1951]. J . D. A. Johnson, J. chhm. SOC [London] 7950, 1743.Angew. Cheni. I6G. Jnhrg. 1954 1 N r . 13 dlese Ztschr., Im Druck.-

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A Study of the Solvent Extraction of Thorium with Thiocyanate

Chen

Sun

Chou

1961

J Chinese Chemical Soc

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A study of the effects of organic solvents, acidity and the Concentration of thiocyanate on the effectiveness of the solvent extraction of thorium has been undertaken. It has been found that both cyclohexanol and a mixture of isoamyl alcohol and ethyl acetate were effective solvents, and the most favorable acidity for the extraction of thorium was at pH 4, and the extractability of thorium increased with increasing thiocyanate concentration, reached a maximum value when thiocyanate concentration was 3N, and then decreased slightly.

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The The Separation of Thorium and Rare Earth Salts by Solvent Extraction.

Cited by 22 publications

References 4 publications

Separations of Yttrium and Some Rare Earths by Liquid-Liquid Extraction

Separations of Yttrium and Some Rare Earths by Liquid-Liquid Extraction

Über die Trennung der Seltenen Erden durch Verteilen zwischen zwei Lösungsmitteln

A Study of the Solvent Extraction of Thorium with Thiocyanate

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