Compositions – Absorptive – or bindive – and chemically yieldive
Patent
1983-10-11
1986-12-23
Miller, Edward A.
Compositions
Absorptive, or bindive, and chemically yieldive
558161, 423 10, C01B 3116, C07F 928
Patent
active
046311424
ABSTRACT:
New diphosphonic acid diesters in which the two phosphorus atoms are bound by a hydrocarbon group while each of the two acid functions of the diphosphonate is esterified by a radical having at least three carbon atoms are prepared by the treatment with a weak base of a corresponding tetramethyl diphosphonate, thereupon replacement of the cations of the base in the resultant disalt, by a radical R by means of a halide of said radical, and finally hydrolysis of the mixed diphosphonate thus obtained. The new compounds are suitable for various known uses of the different diphosphonates and in particular for the complexing of heavy metals; they are used in particular for the extraction of uranium and metals associated with it.
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Sevdic et al, Chem. Abs., 83 (#18), Abs. #153313t (1975), & 9th Coll. Index reference thereto, "C.sub.18 H.sub.40 O.sub.6 P.sub.2 ".
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Gorican et al, J. Chem. Soc., 1964, pp. 513-515.
Hurst, "Solvent Extraction of Uranium from Wet Process Phosphoric Acid", ORNL-TM-2522, p. 39 (1969).
Miller Edward A.
Societe Nationale Elf Aquitaine (Production)
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