EXTRACTION OF SODIUM AND CESIUM POLYIODIDES INTO NITROBENZENE

Journal Article · Sun Dec 01 04:00:00 EST 1963 · Nuclear Science and Engineering (U.S.)

OSTI ID:4119583

Slater, L M

Cesium (<5 x 10-/sup -3/ can be extracted from aqueous sodium iodide solutions into equal volumes oi 0.2M I/sub 2/ in nitrobenzene at 25 deg C with extraction coefficients as great as two thousand. Cesium may be back-extracted by equilibration with approximates 4M or stronger nitiic acid. The separation factor of cesium ( approximates 10/sup -7/M) from sodium in extractions made from sodium iodide solutions into equal volumes of 0.2M 12 in nitrobenzene at 25 deg C iemained fairly constant at approximates 1500 up to approximates 1M NaI. It decreased to approximates 100 at 8M NaI. At this point the cesium extraction coefficient was still greater than two. The decrease in the separation factor is seen as largely due to the decrease in the ratio of the activity coefficient of the cesium ion to that of the sodium ion in the aqueous phase. Extraction data for sodium and cesium from various solutions and under a variety of conditions are given. Sodium and cesium ions are seen extracted as ion association compounds with triiodide ions. Polyiodide ions as complex as the enneaiodide are formed subsequently in the organic phase. Sodium and cesium polyiodides are thought to be essentially ionized in nitrobenzene. Extractions are believed to be the result of the squeezing out'' from aqueous solution into nitrobenzene of ion pairs of cations of small ionic potential together with large anions that are compatible with the organic solvent. The driving force behind the extractions comes largely from the reformation of the hydrogen bonded water structure in the relatively large cavities left by the extracted ion pairs. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-18-006895
• OSTI ID: 4119583
• Journal Information: Nuclear Science and Engineering (U.S.), Journal Name: Nuclear Science and Engineering (U.S.) Vol. Vol: 17; ISSN NSENA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACIDITY
BENZENE
CATIONS
CESIUM COMPLEXES
CESIUM COMPOUNDS
CESIUM IODIDES
CESIUM NITRATES
CHEMISTRY
CONFIGURATION
DIAGRAMS
EXCITATION
IODINE
IONS
MEASURED VALUES
MIXING
MOLECULES
NITRIC ACID
NITROBENZENE
ORGANIC NITROGEN COMPOUNDS
PERFORMANCE
PHENYL RADICALS
QUANTITY RATIO
SODIUM COMPLEXES
SODIUM COMPOUNDS
SODIUM IODIDES
SODIUM NITRATES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENTS
TABLES
THERMODYNAMICS
TRACE AMOUNTS
VARIATIONS
WATER