Absorption of Zirconium Tetrachloride by a KCl–AlCl3 Melt as Applied to the Extractive Distillation of Zirconium and Hafnium Tetrachlorides

Abstract

The process of ZrCl₄ vapor absorption by a KCl–AlCl₃–ZrCl₄ melt is studied on a pilot setup within a temperature range of 324–424°C in columns of different types. The dependence of the equilibrium ZrCl₄ concentration on temperature is established within the studied range of temperatures and pressures. The number of trays required to attain the equilibrium concentration is determined. Some recommendations on the reflux condenser operation regimes in the process of extractive ZrCl₄ and HfCl₄ distillation are given.