Chemical Separation of Isotopes Section Semiannual Progress Report for Period Ending June 30, 1955

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The countercurrent gas-liquid system BF3(g)—anisole·BF3(l) for the concentration of boron isotopes has been studied. The single-storage separation factor varies from 1.039 at 0°C to 1.029 at 30°C. Rate of exchange is rapid, and, with efficient contacting equipment, complete exchange may be obtained in less than 15 sec. A total separation of 1.525 has been realized in laboratory equipment. The critical-product reflux reaction is quite efficient. Only about 55 moles of BF3 remain in each million moles of effluent solvent under laboratory conditions. The vapor pressure of BF3 over the complex rises sharply as the temperature is increased. At 0°C the … continued below

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Clewett, G. H. & Drury, J. S. February 23, 1956.

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  • Main Title: Chemical Separation of Isotopes Section Semiannual Progress Report for Period Ending June 30, 1955
  • Series Title: ORNL (Series)
  • Series Title: Oak Ridge National Laboratory Reports
  • Added Title: Oak Ridge National Laboratory Report ORNL-2005 (Del.)

Description

The countercurrent gas-liquid system BF3(g)—anisole·BF3(l) for the concentration of boron isotopes has been studied. The single-storage separation factor varies from 1.039 at 0°C to 1.029 at 30°C. Rate of exchange is rapid, and, with efficient contacting equipment, complete exchange may be obtained in less than 15 sec. A total separation of 1.525 has been realized in laboratory equipment. The critical-product reflux reaction is quite efficient. Only about 55 moles of BF3 remain in each million moles of effluent solvent under laboratory conditions. The vapor pressure of BF3 over the complex rises sharply as the temperature is increased. At 0°C the pressure is 150 mm Hg, and at 40°C the pressure has risen to 1800 mm Hg. From vapor-pressure measurements, an approximate upper limit of ΔH= -12kcal per mole of complex was calculated for the reaction [equation not transcribed]. Qualitative tests indicate good resistance of anisole to decomposition by BF3 under plant conditions. The uncatalyzed exchange of boron between BF3 and BCl3 was found to be too slow to be exploited in a countercurrent system. The single-stage, equilibrium separation factor for the Nitrox system is a function of acid concentration. At 26°C the factor ranges from 1.064 with 1 M acid to 1.020 with 15 M acid. A contractor is described for studies on gas-liquid equilibria. A product-end refluxer for the Nitrox system, NO(g) vs HNO3(aq), was designed and operated and was found to be satisfactory for use in this exchange system. The nitrogen-isotope separation factor for the system NO(g) vs FeNO++(aq) was found to be 1.009 at 16.5°C. The N13 concentrated in the liquid phase. The fractionation of nitrogen isotopes between aqueous ammonium hydroxide and metal-ammonia complexes adsorbed on Dowex 50 resin is being studied. The separation factors for complexes of Ni, Cu, and Zn have been measured; further experiments are in progress.

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  • Report No.: ORNL-2005 (Del.)
  • Accession or Local Control No: metadc1957018
  • Archival Resource Key: ark:/67531/metadc1957018

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  • February 23, 1956

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Clewett, G. H. & Drury, J. S. Chemical Separation of Isotopes Section Semiannual Progress Report for Period Ending June 30, 1955, report, February 23, 1956; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1957018/: accessed November 11, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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