Process for introducing zirconium tetrachloride, hafnium tetrachloride and mixtures thereof into a column for the continuous extractive distillation under pressure of said chlorides
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United States of America Patent
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Apr 17, 1990
Grant Date -
N/A
app pub date -
Mar 6, 1989
filing date -
Mar 31, 1988
priority date (Note) -
Expired
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Abstract
The process and the device according to the invention relate to the introduction, at a stable, known flow rate, of sublimable tetrachloride into a column for continuous extractive distillation under pressure of the chlorides. The sublimable tetrachloride is dissolved in a hot dissolver in a liquid solvent such as KAlCl.sub.4, and is then recirculated by pump at a stable, known flow rate into an evaporator connected to the column. The solution is then heated in an evaporator in order to sublime the majority of the product which it contains, the sublimed vapors thus passing into the column at a stable, known flow rate. The process according to the invention is adapted, in particular, to a plant for the production of ArCl.sub.4 of nulear purity and of HfCl.sub.4.
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