THERMODYNAMICS FOR THE EXTRACTION OF URANYL NITRATE AND NITRIC ACID BY ESTERS OF THE TYPES (RO)$sub 3$P = O AND (RO)$sub 2$RP = O

Journal Article · Thu Aug 20 04:00:00 EDT 1959 · Journal of the American Chemical Society (U.S.)

DOI:https://doi.org/10.1021/ja01525a015· OSTI ID:4221430

Siddall, III, T H

The thermodynamic quantities, DELTA H, DELTA F and DELTA S, were obtained for the extraction of uranyl nitrate and of nitric acid by twenty-one compounds of the types (RO)/sub 3/P in equilibrium O and (RO)/sub 2/RP in equilibrium O. The values or DELTA S suggest that a very open structure is retained by the extractant molecules when they are bound to uranyl nitrate. The strength of the bonds formed with the uranyl ion is substantially altered as substituents on the phosphorus atom are replaced by various radicsls. A partial correlation with Kharasch's electronegativity scale was obtained for the substituents. When DELTA F for the extraction of uranyl nitrate was plotted against DELTA F for the extraction of nitric acid, a straight line was obtained. However, the fit of the data to the straight line is only approximate. Evidence was obtained that an extra order--disorder transition accompanies extraction of uranyl nitrate by certain extractants, but not with others. (auth) A unit for the extraction of uranium with ether is described. The ether phase is drawn into a flask by means of a vacuum pump, the ether is distilled, in vacuum, through a condenser into another cooled flask, and the residue in the first flask is rinsed into an evaporation dish. Prior to distillation of the first ether extract it is necessary to draw in, by suction, approximately 20 ml of water to remove the possibility of an explosion. The unit includes no rubber connections, distillation proceeds rapidly, and most of the ether is recovered. (auth)

• Research Organization: E. I. du Pont de Nemours & Co., Aiken, S.C.
• Sponsoring Organization: USDOE
• NSA Number: NSA-13-020931
• OSTI ID: 4221430
• Journal Information: Journal of the American Chemical Society (U.S.), Journal Name: Journal of the American Chemical Society (U.S.) Vol. Vol: 81; ISSN JACSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
DIAGRAMS
ELECTRONS
ENTHALPY
ENTROPY
ESTERS
FREE ENERGY
INTERFERING ELEMENTS
LATTICES
MATHEMATICS
MEASURED VALUES
MOLECULES
NITRIC ACID
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHORUS COMPOUNDS
RADICALS
SOLVENT EXTRACTION
SOLVENTS
TABLES
THERMODYNAMICS
URANYL NITRATES