The Fractional Separation of Zirconium and Hafnium by Extraction with Thenoyltrifluoroacetone

Abstract

Separation of Zirconium and Hafnium with Thenoyltrifluoroacetone 3179 can be added to their discussion except to say that a completely satisfying theory of the behavior of such solutions is not yet possible, and to emphasize again the fact that interactions between the unlike molecules are involved, in addition to the type of association of the alcohol postulated by Redlich and Kister.10 Summary For the system ethanol-methylcyclohexane, densities and refractive indices have been measured at 25°. Total and partial vapor pressures have been determined at 35 and 55°. Thermodynamic con-sistency of the data was found to be satisfactory.Vapor compositions are represented by the empirical equation previously developed by the authors, to within 0.005 mole fraction. They can be represented by an equation developed by Redlich and Kister, with somewhat less accuracy, and with rather anomalous values of the equilibrium constant involved.The excess free energy, entropy and enthalpy have been calculated from the data, and exhibit a similar behavior to that of other alcohol-hydrocarbon systems.Peoria 5, Illinois

Inorganic Extraction Studies on the System between Bis(2-ethyl hexyl)-orthophosphoric Acid and Hydrochloric Acid (I)

“…By Kan KIMURA (Received January 26,1960) During the last decade, alkyl esters of orthophosphoric acid as liquid-liquid solvent extraction reagents have been investigated widely for both chemical and chemical engineering purposes.…”

Role in Extraction in Analytical Chemistry

“…The separation of zirconium and hafnium by means of the preferential extraction of the chelate of the d-diketone, thenoyltrifluoroacetone, into benzene by Huffman and Beaufait (18) illustrates the possibilities of organometallic extractions for the separation of elements of very similar chemical properties. The nature of the extraction equilibrium of this zirconium chelate has been examined in detail by Connick and McVey (3).…”

Determination of V, Cr, Mn, Fe, Ni, Cu, Cd, Pb, and U in Zirconium Matrix by Inductively Coupled Plasma Mass Spectrometry Employing Microwave-Assisted Digestion and Matrix Separation by Synergistic Solvent Extraction

“…(1,7,(36)(37)(38)(39)(40)(41)(42)(43)(44)(45), to separate the matrix and reduce the total dissolved solid concentration to tolerable limits. A number of complexing agents (1,(46)(47)(48) are available for zirconium, but few would qualify for quantitative complexation with zirconium without affecting traces of these elements. Uranium is an important element which has a specification of 3.5 ppm (13-16) in nuclear-grade zirconium alloys as it undergoes fission in nuclear reactors.…”