The Vapor Pressure of Zirconium Fluoride

Sense, Karl A.; Snyder, Matthew; Filbert, R.B.

doi:10.1021/j150521a014

Cited by 31 publications

(4 citation statements)

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“…This led to the assumption that the sublimation rates are area-dependent only and sublimation does not take place from the bulk of the material. Figure 1 gives a range of vapour pressures obtained from the literature for both ZrF 4 and HfF 4 at temperatures above 600°C (Benedict Pigford and Levi, 1981;Cantor et al, 1958;Koreneo et al, 1972;Sense et al, 1953Sense et al, , 1954.…”

mentioning

confidence: 99%

Selective sublimation/desublimation separation of ZrF4 and HfF4

Postma

Crouse

2017

J. South. Afr. Inst. Min. Metall.

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The separation of zirconium and hafnium, which is essential in the nuclear industry, is difficult due to the great similarities in their chemical and physical properties. In contrast to the traditional aqueous chloride separation systems, the current process focuses on dry fluoride-based technologies, which produce much lower volumes of chemical waste. In the present work, separation is achieved in both a sublimation and a desublimation step, where the Zr/Hf mole ratio varies between 160 and 245 across the length of desublimer and 86 to 40 within the sublimer. Model predictions for the sublimation/desublimation rates fit the experimental results well, with deviations becoming more apparent as sublimation proceeds. This may be attributed to crust formation preventing the system from reaching thermodynamic equilibrium. The model adequately predicts time-and temperature-dependent mole ratios of both the sublimer residue and of the desublimed mass. zirconium, hafnium, fluoride, sublimation, desublimation.

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confidence: 99%

Selective sublimation/desublimation separation of ZrF4 and HfF4

Postma

Crouse

2017

J. South. Afr. Inst. Min. Metall.

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“…13 Scalar properties (excluding critical) and Antoine's equation adapted from (Canterford, 1968 14 T nbp and T mp adapted from (Winter, 2001). 15 Extended Antoine's equation adapted from (Sense, 1963). 16 T nbp and T mp adapted from (Winter, 2001).…”

Section: Mass % He In Streammentioning

confidence: 99%

Direct Energy Conversion Fission Reactor Annual Report for the Period August 15,2000 Through September 30,2001

Brown¹

2002

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“…Apparently the first vapor pressure values of solid zirconium tetrafluoride were those obtained by Lauter 1 by using a static method. Sense et al 2,3 determined a set of vapor pressures by the transpiration method. Cantor et al 4 studied the ZrF 4 activity in RbF-ZrF 4 mixtures by using a differential manometer measuring also the vapor pressures of the pure compound.…”

Section: ' Introductionmentioning

confidence: 99%

Vapor Pressure of Zirconium Tetrafluoride

Brunetti¹,

Piacente²,

Scardala³

2011

J. Chem. Eng. Data

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Measurements were made of the vapor pressures of zirconium tetrafluoride by using a torsion effusion apparatus. The temperature dependence fit the equation: log(p/Pa) = (15.20 +/- 0.15) - (11 900 +/- 200)/(T/K) (from 685 to 828 K). The compound vaporizes congruently in the monomeric form. With treatment of the measured vapor pressures by second- and third-law methods, the standard sublimation enthalpy Delta H-sub degrees(298 K) = (239 2) kJ . mol(-1) was obtained

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The Vapor Pressure of Zirconium Fluoride

Cited by 31 publications

References 0 publications

Selective sublimation/desublimation separation of ZrF4 and HfF4

Selective sublimation/desublimation separation of ZrF4 and HfF4

Direct Energy Conversion Fission Reactor Annual Report for the Period August 15,2000 Through September 30,2001

Vapor Pressure of Zirconium Tetrafluoride

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