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THERMODYNAMICS FOR THE EXTRACTION OF URANYL NITRATE AND NITRIC ACID BY ORGANOPHOSPHORUS COMPOUNDS (in Japanese)

Journal Article · · Kogyo Kagaku Zasshi (Japan) Merged with Nippon Kagaku Zasshi to form Nippon Kagaku Kaishi
OSTI ID:4040808
;

The thermodynamic quantities, DELTA F, DELTA H, DELTA S, and DELTA C for the extraction of uranyl nitrate and nitric acid by a series of organophosphoric compounds are obtained. The compounds are R/sub 3/PO, (RO)R/sub 2/PO, (RO)/sub 2/RPO, (RO/sub 3/)PO, and (RO)/sub 2/HPO, in all of which R is an n-butyl group. The substantial changes in DELTA F and DELTA H are shown as replacing an n-butyl group successively by an n-butoxy group. The values of DELTA S for the uranyl nitrate extraction remain approximately at a constant of -- 8 to --9 eu, irrespective of the types of extractants and their diluents, but those of DELTA S for the nitric acid extraction vary from +1 to -38 eu, depending on the diluents used. When the values of DELTA H for the extraction of uranyl nitrate are plotted against the values of DELTA H for the extraction of nitric acid in a series of extractants, a straight line is obtained. It is also shown that there is a linear relationship between the values of DELTA H and the stretching frequencies of the phosphoryl group of the extractant, which is bonded with uranyl nitrate or nitric acid. The values of DELTA F/sub 0/, DELTA H/sub 0/, and DELTA S/sub 0/ are calcula ted by extrapolating both the ionic strength in an aqueous phase and the concentration of tri-n-butyl phosphate in an organic phase to zero. (from NSA of Japan)

Research Organization:
Kyoto Univ.
NSA Number:
NSA-18-017957
OSTI ID:
4040808
Journal Information:
Kogyo Kagaku Zasshi (Japan) Merged with Nippon Kagaku Zasshi to form Nippon Kagaku Kaishi, Journal Name: Kogyo Kagaku Zasshi (Japan) Merged with Nippon Kagaku Zasshi to form Nippon Kagaku Kaishi Vol. Vol: 66; ISSN KGKZA
Country of Publication:
Country unknown/Code not available
Language:
Japanese

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Related Subjects

BUTYL PHOSPHATES
BUTYL RADICALS
CHEMISTRY
CONFIGURATION
DECOMPOSITION
DIAGRAMS
ENTHALPY
ENTROPY
EQUATIONS
ESTERS
FREE ENERGY
IONS
MEASURED VALUES
MOLECULES
NITRIC ACID
NUMERICALS
ORGANIC PHOSPHORUS COMPOUNDS
OSCILLATIONS
PHASE DIAGRAMS
QUANTITY RATIO
SOLUTIONS
SOLVENT EXTRACTION
SPECIFIC HEAT
TABLES
THERMODYNAMICS
URANYL NITRATES
VARIATIONS
WATER