Vapor pressure of ZrCl{sub 4} and HfCl{sub 4} over melt systems KCl + AlCl{sub 3} (1:1.04 mol) + ZrCl{sub 4} and KCl + AlCl{sub 3} (1:1.04 mol) + HfCl{sub 4}
- Bhabha Atomic Research Centre, Bombay (India). Materials Group
The vapor pressures of ZrCl{sub 4} and HfCl{sub 4} over a molten salt mixture of KCl + AlCl{sub 3} (1:1.04 mol) + XCl{sub 4} (X = Zr, Hf) was determined in the temperature range of 485--627 K by the transpiration technique. The compositions of ZrCl{sub 4} and HfCl{sub 4} in the molten salt system were chosen such that it would be useful for vapor phase separation of ZrCl{sub 4} from Zr(Hf)Cl{sub 4} by an extractive distillation technique employing KCl + AlCl{sub 3} as the fused salt solvent. The relative volatility factor of p{sub HfCl{sub 4}}/p{sub ZrCl{sub 4}} over the KCl + AlCl{sub 3} + XCl{sub 4} (X = Zr, Hf) molten salt systems was determined to be 1.5 in the composition range of 16--30 mol % HfCl{sub 4} or ZrCl{sub 4}. This indicated the possibility of separation of ZrCl{sub 4} and HfCl{sub 4} by extractive distillation with KCl + AlCl{sub 3} molten salt solvent at ambient pressure. Zirconium, with some minor alloy addition, is primarily used in nuclear power reactors as core structural materials due to its low thermal neutron cross section, excellent high-temperature strength, and resistance to corrosion in water.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 94341
- Journal Information:
- Journal of Chemical and Engineering Data, Vol. 40, Issue 4; Other Information: PBD: Jul-Aug 1995
- Country of Publication:
- United States
- Language:
- English
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