Liquid-vapor equilibrium in systems with dilute solutions of metal fluorides in uranium hexafluoride

Prusakov, V.N.; Ezhov, V. K.; Efremov, E. A.

doi:10.1007/bf01132645

At Energy

1976

DOI: 10.1007/bf01132645

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Liquid-vapor equilibrium in systems with dilute solutions of metal fluorides in uranium hexafluoride

V.N. Prusakov¹,

V. K. Ezhov²,

E. A. Efremov³

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Cited by 2 publications

(3 citation statements)

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“…This expression describes with a 35% error 90% of all experimental partition coefficients obtained in the present work and in [5][6][7] in extremely dilute solutions based on uranium hexafluoride for compounds whose critical temperature is less than the solution temperature (~365 K).…”

mentioning

confidence: 94%

“…The following relation is presented in [5] for describing the variation of the content of impurities during the evaporation of the sample with a prescribed partition coefficient α:…”

mentioning

confidence: 99%

“…Analysis of the experimental data on the distribution of different metal fluorides and freons between the liquid and vapor phases [5][6][7], including those obtained for binary solutions of uranium hexafluoride with fluorocarbons, made it possible to obtain the following expression for the equilibrium partition coefficients for extremely dilute solutions based on uranium hexafluoride:…”

mentioning

confidence: 99%

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Distribution of trace impurities of fluorocarbons in the condensed phase – vapor system based on uranium hexafluoride in equilibrium and during evaporation

Soloviev¹,

Saprygin²,

Golik³

et al. 2010

At Energy

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The results of investigations of the distribution of fluorocarbons in two-phase solid phase-gas and liquidvapor systems based on uranium hexafluoride are presented. The systems are studied under equilibrium conditions, under which a constant distribution of fluorocarbons is established between the phases in a closed volume, and under nonequilibrium conditions created with stationary removal of the gas phase from the volume with liquid or solid uranium hexafluoride. The investigations were performed on specially prepared standard mixtures of uranium hexafluoride with fluorocarbon fraction from 10 -4 to 10 -1 %. The special features of the evaporation processes in the two-phase systems studied are shown, the distribution laws of the fluorocarbons between phases of the main substance are established, and the regimes of evaporation of the mixtures with the smallest disruptions in the uniformity of the fluorocarbon inflow with the flow of the evaporated uranium hexafluoride are determined.Fluorocarbons are compounds with the structural formula C n F m and molecular mass from 700 to 1000 amu, much larger than that of uranium hexafluoride. Two-phase systems of uranium hexafluoride with fluorocarbons are of interest on the one hand because the content of fluorocarbons in uranium hexafluoride can be determined by obtaining small representative samples from filled shipment containers and technological tanks. On the other hand there is the desire to ensure that impurities flow uniformly into the gas phase when the uranium hexafluoride evaporates from the containers and tanks in the process systems in uranium separation plants. These requirements predetermined the problems investigated in the present investigation.Two-phase systems were studied in standard mixture of uranium hexafluoride with fluorocarbons, prepared by the mass and volume methods. After they were prepared, the mixtures were certified by following analytical methods developed in the Central Plant Laboratory of the Urals Electrochemical Combine: thermal destruction of the fluorocarbons to tetrafluoromethane [1], mass-spectrometric method with chemosorption of uranium hexafluoride on sodium fluoride [2] and chromato-mass-spectrometric method [3].

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mentioning

confidence: 94%

“…The following relation is presented in [5] for describing the variation of the content of impurities during the evaporation of the sample with a prescribed partition coefficient α:…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Distribution of trace impurities of fluorocarbons in the condensed phase – vapor system based on uranium hexafluoride in equilibrium and during evaporation

Soloviev¹,

Saprygin²,

Golik³

et al. 2010

At Energy

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Commercial rectification facility for deep purification of sublimate uranium hexafluoride

Ezhov

2007

At Energy

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The history of the development of the first domestic commercial rectification facility for deep purification of uranium hexafluoride sublimate at the Polimer plant of the Kirovo-Chepets Chemical Works is presented. A description, the technological scheme, and the operating regimes of the facility are described. The results of a chemical analysis of the initial and rectified uranium hexafluoride are reported.In 1970, F. I. Novoselov and V. S. Simonenko -the directors of a division producing uranium hexafluoride at the Polimer plant, which quickly became part of the Kirovo-Chepets Chemical Works -paid a visit to I. K. Kikoin, who was the head of a scientific division at the I. V. Kurchatov Institute of Atomic Energy. They told him about the desire to build in this division a rectification facility for obtaining uranium hexafluoride with a high degree of purity and requested that he provide scientific guidance for this project and organizational assistance. It was natural to turn to Kikoin for this, because at the end of the 1950s the rectification method for purifying uranium hexafluoride as a raw material and as a material obtained from irradiated nuclear fuel was studied in a division which he headed. The first domestic experiment in this direction is the thesis work performed by V. A. Legasov under the direction of O. G. Lebedev. They distilled a mixture obtained by dissolving irradiated uranium metal in liquid chlorine trifluoride.Subsequently, the properties of dilute solutions based on uranium hexafluoride were studied [1], and investigations of the phase equilibria of mixtures of hexa-and pentafluorides of metals with one another and with the hydrogen fluoride were performed, the phenomenon of azeotropism and separation of such systems was investigated [2][3][4][5][6][7], and the kinetic and hydrodynamic features of the rectification of mixtures of uranium hexafluoride were examined [8].Thus, the investigations performed at the Kurchatov Institute of Atomic Energy formed the physicochemical foundations of a method for rectification of uranium hexafluoride, and the operation of large facilities at the Urals Electrochemical Works, the Siberian Chemical Works, and the Industrial Association Élektrokhimicheskii Zavod with the participation of the staff of the Institute confirmed that the rectification purification of uranium hexafluoride is highly efficient and the method is reliable and easy to implement technologically.One motive for the interest shown by the leadership of the Kirovo-Chepets Chemical Works in improving the purity of the uranium hexafluoride produced was that the new centrifuge equipment used at the plants to separate uranium isotopes required an initial product with minimal impurity content. The lower content of impurities in the initial product increase the reliability of gas centrifuges, decreased the material flows processed in the purification cascades and in the uranium recovery facilities, and improved the technological parameters of the uranium hexafluoride evaporation unit. In addition...

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Liquid-vapor equilibrium in systems with dilute solutions of metal fluorides in uranium hexafluoride

Cited by 2 publications

References 2 publications

Distribution of trace impurities of fluorocarbons in the condensed phase – vapor system based on uranium hexafluoride in equilibrium and during evaporation

Distribution of trace impurities of fluorocarbons in the condensed phase – vapor system based on uranium hexafluoride in equilibrium and during evaporation

Commercial rectification facility for deep purification of sublimate uranium hexafluoride

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