Recovery of hydrogen fluoride from an aqueous solution...

Details Recovery of hydrogen fluoride from an aqueous solution... Recovery of hydrogen fluoride from an aqueous solution...

C - Chemistry, Metallurgy

01

B

23/180

C01B 7/19 (2006.01)

Patent

CA 1308230

RECOVERY OF HYDROGEN FLUORIDE FROM AN AQUEOUS SOLUTION CONTAINING AMMONIUM FLUORIDE AND HYDROGEN FLUORIDE ABSTRACT OF THE DISCLOSURE A method of recovering HF from an aqueous solution containing NH4F and HF is provided. The solution is contacted with a water-immiscible, amine-containing extractant which extracts HF in preference to NH4F. The HF:NH4F molar ratio of the solution, the amine, the concentration of the amine in the extractant and the contact temperature are selected so as to form an HF- loaded organic liquid phase having an HF:amine molar ratio of at least about 1.2. The extractant is preferably selected from amines, amine-HF complexes, quaternary amine fluorides and mixtures thereof with inert organic diluents. After equilibration, the HF- loaded amine is separated from the solution and HF is stripped therefrom in an amount sufficient to lower the HF:amine molar ratio by at least about 0.2.

563663

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