C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/150, 23/404
C22B 34/10 (2006.01) B01D 3/00 (2006.01) C01G 25/04 (2006.01) C01G 27/04 (2006.01)
Patent
CA 1171664
ABSTRACT OF THE DISCLOSURE A process for separation of zirconium and hafnium tetrachloride from a mixture comprising such chlorides, the process comprising: introducing said mixture of tetrachloride into a closed system; heating at a vaporization zone, the mixture, which exists an liquid at least partially, to a temperature of at least approximately 440°C under a pressure of at least 25 atoms, to cause generation and upward flow of vapor; at a condensation some over said vaporization zone, continuously condensing and flow down a substantial part of ascending vapor back to the vaporization zone, thus transferring hafnium tetrachloride gradually to a remaining small part vapor; removing the vapor phase as enriched in hafnium tetrachloride from the system; maintaining the pressure condition substantially throughout the vaporization; and recovering from the vaporization zone zirconium tetrachloride substantially removed of hafnium content.
381713
Ishizuka Hiroshi
Meredith & Finlayson
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