Method of separating HF and SiF.sub.4 from HCl

Details Method of separating HF and SiF.sub.4 from HCl Method of separating HF and SiF.sub.4 from HCl

1986-08-13

1987-12-22

Metz, Andrew H.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423240, 423341, 423466, 423483, 423489, 55 71, 203 50, C01B 707

Patent

active

047146044

ABSTRACT:
A method of separating HF from a mixture including HF and HCl is disclosed wherein the mixture is contacted with silica causing the HF to react with the silica to form SiF.sub.4. The concentration of HCl is increased thereby increasing the relative volatility of SiF.sub.4 /HCl. The SiF.sub.4 is then removed as an aqueous distillate. The concentration of the HCl can be increased by various methods including adding gaseous or concentrated HCl to the mixture or by distilling off a portion of the water to thereby increase the concentration of the HCl. This method provides an efficient method of removing SiF.sub.4 and HF from HCl.

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