Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Radioactive metal
Patent
1995-03-28
1997-02-11
Mai, Ngoclan
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Radioactive metal
423157, 423181, 210634, C01F 1100
Patent
active
056030746
ABSTRACT:
Preparation and use of tetra-C-alkyl cobalt dicarbollide for extraction of cesium and strontium into hydrocarbon solvents. Tetra-C-alkyl derivatives of cobalt dicarbollide, Co(C.sub.2 R.sub.2 B.sub.9 H.sub.9).sub.2.sup.- (CoB.sub.2 R.sub.4.sup.- ; R=CH.sub.3 and C.sub.6 H.sub.13) are demonstrated to be significant cesium and strontium extractants from acidic and alkaline solutions into non-toxic organic solvent systems. Extractions using mesitylene and diethylbenzene are compared to those with nitrobenzene as the organic phase. CoB.sub.2 -hexyl.sub.4.sup.- in diethylbenzene shows improved selectivity (10.sup.4) for Cs over Na in acidic solution. In dilute alkaline solution, CoB.sub.2 -hexyl.sub.4.sup.- extracts Cs less efficiently, but more effectively removes Sr from higher base concentrations. A general synthesis of tetra-C-alkyl cobalt dicarbollides is described.
REFERENCES:
M. Frederick Hawthorne et al., ".pi.-Dicarbollyl Derivatives of the Transition Metals. Metallocene Analogs," J. Am. Chem. Soc. 90, 879 (1968).
M. F. Hawthorne et al., "Icosahedral Carboranes and Intermediates Leading to the Preparation of Carbametallic Boron Hydride Derivatives," Inorg. Synth. X, 91 (1967).
T. L. Heying et al., "New Series of Organoboranes. III. Some Reactions of 2-Dicarbaclovododecaborane(12) and its Derivatives," Inorg. Chem. 2, 1097 (1963).
Miller, R. L. et al; Extraction of Cesium and Strontium into Hydrocarbon Solvents Using Tetra-C-Alkyl Cobalt Dicarbollide, 1995, Solvent Extra Ion Exch. 13(5), pp. 813-827.
Tran, Hong Ha, et al; Extraction of Cs, Sr and Ba into Nitrobenzene in the Presence of Cobalt Dicarbollide and Mono-n-Dodecyclethens of Polyethylene Glycol, Nucleon 2, 1993, pp. 6-9.
Abney Kent D.
Kinkead Scott A.
Miller Rebecca L.
Pinkerton Anthony B.
Freund Samuel M.
Mai Ngoclan
The Regents of the University of California
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