Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide
Patent
1987-04-10
1989-11-21
Russel, Jeffrey E.
Chemistry of inorganic compounds
Nitrogen or compound thereof
Ammonia or ammonium hydroxide
423471, 423483, 423484, C01B 719, C01B 21087, C01B 21088
Patent
active
048821349
ABSTRACT:
A method of recovering HF from an aqueous solution containing NH.sub.4 F and HF is provided. The solution is contacted with a water-immiscible, amine-containing extractant which extracts HF in preference to NH.sub.4 F. The HF:NH.sub.4 F 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.
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IMC Fertilizer, Inc.
Russel Jeffrey E.
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