Process for the recovery of ammonia and fluoride values from amm

Details Process for the recovery of ammonia and fluoride values from amm Process for the recovery of ammonia and fluoride values from amm

1986-07-21

1987-12-15

Doll, John

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

159 471, 203 12, 203 14, 260694, 423490, 546345, C01B 719

Patent

active

047132310

ABSTRACT:
The components of aqueous ammonium fluoride solutions are recovered as ammonia and potassium fluoride by adding potassium hydroxide, distilling to remove and secure the ammonia, concentrating the remaining solution and combining it with a water soluble, dipolar, aprotic solvent, such as N-methylpyrrolidone, and distilling to remove the remaining water to obtain the potassium fluoride as a slurry in the solvent. Slurries of potassium fluoride are useful in the replacement of chloride in heterocyclyl and aryl chlorides by fluoride.

REFERENCES:
patent: 1581819 (1926-04-01), Siegel
patent: 2285093 (1942-06-01), Kokatnur
patent: 2339160 (1944-01-01), Dunn et al.
patent: 2527320 (1950-10-01), McHarness et al.
patent: 3842161 (1974-10-01), Hyoky

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