The Solubility of Thorium Nitrate Tetrahydrate in Organic Solvents at 25°C.

Templeton, Charles C.; Hall, Norris F.

doi:10.1021/j150456a017

Cited by 15 publications

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“…Some measurements were made on the acidified systems after long periods of standing, and marked changes were noted. Coincident with these changes, gas evolution was observed similar to that noted in the previous solubility work (6). This probably resulted from oxidation of the organic solvents by the nitric acid.…”

supporting

confidence: 84%

“…That the change with temperature is negligible with respect to the analytical errors is consistent with other data. We have previously shown that the change of the solubility of Th(N03)4-4H20 with temperature in these solvents is no greater than the experimental error (6). Seidell (4) quotes Misciattelli (3) to the effect that the solubility of thorium nitrate in water (from separate sets of data) is: The heat effect of the nitrate on passing from one solvent to the other is the difference between the two very small heats of solution corresponding to these two small temperature changes (d In K/dT = AH/RT2).…”

mentioning

confidence: 88%

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The Distribution of Thorium Nitrate between Water and Certain Alcohols and Ketones

Rothschild¹,

Templeton²,

Hall³

1948

J. Phys. Chem.

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confidence: 84%

mentioning

confidence: 88%

The Distribution of Thorium Nitrate between Water and Certain Alcohols and Ketones

Rothschild¹,

Templeton²,

Hall³

1948

J. Phys. Chem.

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“…Some of the other solvents which were reported to have a favorable solubility included nitromethane and nitroethane. Data on the distribution coefficient of thorium nitrate between an aqueous phase and the lower alcohols and ketones were also reported in these studies (17).…”

Section: • Isc-115mentioning

confidence: 84%

“…It was found unfcjrtunate that most con^slexes are stable only in neutral or slightly basic media, conditions which could not possibly haye been obtained since thorium phosphate starts to precipitate at acidities lower than 2 normal* Precipitation of calcium sulfate from the sulfuric add -monazite solution Having pToduced no promising results from ar^ attempt to extract from the sulfuric acid-monazite solution, the next step was to modify the solution. Since it was known that thoiium nitrate was soluble in certain organic solvents (17) it was atteagsted to extract the thorium as the nitrate. The simple addition of nitric acid was tried and found unsuccessful.…”

Section: Extraction Of a Sulfuric Acid -Monazite Solutionmentioning

confidence: 99%

Solvent Extraction of Solutions Containing Rare Earths. Preparation of Thorium Compounds From Monazite by Sulfuric Acid Decomposition and Solvent Extraction

Whatley¹,

Bridger²

1950

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An investigation was made of the feasioility of producing pure thorium compounds from monazite sand by a process involving the digestion of the sand with sulfuric acid and separating the thorium from the rare earths by solvent extractionoThe extractability of the solution produced by taking up the digested sand with water was studied using several common solvents and several coraplexing agents. This was a continuation of a previous study made in this laboratory. The results were essentially negative lea.ding to the conclusion that extraction from this solution was not practical.•Possibilities for desirable modification of this solution were then considered. Precipitation of the sulfate from the system with lime and nitric acid was tried and found to be partially successful but impractical because of the large losses of thorium by occlusion in the copious calcium sulfate precipitate.• A Successful method for producing ap extractable solution was found, consisting of neutralizing the original solution with ammonium hydroxide to precipitate the heavy metals as phosph.ites, and, after filtering and washing, dissolving this precipitate in nitric acid with the aid of ferric nitrated * ISaJjh-.xspeBet is based on a Moai**^'*: tl^ais ty Marvin E. WiiatiiQr , suballtted "In June 1950.Studies were made of extracting this type of solution with tributyl phosphate to determine the composition most conducive to extraction. It was found that the presence of small amounts of sulfate ion tended to decrease the proportion but increase the pturity of the thorium extracted. It was found that the presence of the ferric ion tended to markedly increase the degree of ^rtraction to the point -Khere 98^ of the thorium was being extracted in a single pass. This increase in extraction was accompanied by a Slight decrease in the purity of the thorium extracted. It was found that as the concentration of free nitric acid was increased beyond k molar, extraction decreased. Calcium nitrate, in concentrations up to 0,5 molar produced no significant effect upon extraction.A sequence of batch extractions was carried out so as to siimilate continuous countercurrent extraction using tilbutyl phosphate and a typical solution. All of the thori\im and uranium were found to be extracted corapletely out of the aqueous phase. In one ea^iidment a simulated scrubbing section was included, using a nitric acid solution as a wash. This experiment produced thorium nitrate of 93/S purity. It was concluded that, by using a sufficient ntmiber of equilibrium steps and the proper wash rate, thorium nitrate could be completely recovered from the solution at a very high purity.The proposed process is as follows: (l) digesting the sand with sulfuric acid, (2) dissolving the digested mass in water, (3) precipitating from this solution, by neutralization, the heavy metals as phosphates, (k) filtering and dissolving this precipitate in nitric acid, preferably with the aid of ferric nitrate, (5) selectively extracting the thorium and uranium from this solution, us...

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“…The distribution of thorium nitrate between water and three types of organic solvents has been shown (5,6) to be described by a relation of the form: where Th(N03)4 was regarded as a single molecular species. On this empirical basis, the exponent a was between 4.8 and 5.5 for certain alcohols, and between 7 and 8 for methyl ketones.…”

Section: Nature Of the Distribution Reactionmentioning

confidence: 99%

Thorium Nitrate. III. The Distribution of Thorium Nitrate between Water and Certain Esters and the Nature of the Distribution Equilibrium.

Templeton¹,

Rothschild²,

Hall³

1949

J. Phys. Chem.

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The Solubility of Thorium Nitrate Tetrahydrate in Organic Solvents at 25°C.

Cited by 15 publications

References 0 publications

The Distribution of Thorium Nitrate between Water and Certain Alcohols and Ketones

The Distribution of Thorium Nitrate between Water and Certain Alcohols and Ketones

Solvent Extraction of Solutions Containing Rare Earths. Preparation of Thorium Compounds From Monazite by Sulfuric Acid Decomposition and Solvent Extraction

Thorium Nitrate. III. The Distribution of Thorium Nitrate between Water and Certain Esters and the Nature of the Distribution Equilibrium.

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