Vapour phase dechlorination

HCl and HBr removal from gaseous effluents. Bhaskar et al. examined Ca-, Fe-, Zn-and Mg-based sorbents for this purpose, obtaining good results with Ca-Z. Hakata et al. tested an iron oxide-carbon composite catalyst for the selective vapour phase dechlorination of chloroalkanes. 

Removal of the hafnium tetrachloride from the zirconium tetrachloride cannot easily be achieved in a direct manner. However, the addition compounds with phosphorus pentachloride and with phosphorus oxychloride (3Zr(Hf)Cl4.2POCls) have been separated by fractional distillation on a small scale.A proposal has also been made to separate the chloride by vapour phase dechlorination with a mixture of chlorine and oxygen, making use of the difference in equilibrium constant for the two reactions ... 

Prakash, B. and Surdaram, C. V. Separation of hafnium from zirconium by vapour phase dechlorination. Proc. 1st Int. Conf. on the Peaceful Uses of Atomic Energy, Geneva, 1955. Pai r 876. 

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