Process of preparing alkali monofluorophosphate

Details Process of preparing alkali monofluorophosphate Process of preparing alkali monofluorophosphate

1980-11-20

1983-02-15

Warren, Charles F.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

423185, 423300, C01B 2510

Patent

active

043741088

ABSTRACT:
An alkali monofluorophosphate expressed by the formula M.sub.2 PO.sub.3 F, where M represents Na or K, can readily be synthesized under a relatively mild reaction condition by making HF gas contact with powdery or fine granular M.sub.4 P.sub.2 O.sub.7 or M.sub.2 HPO.sub.4 placed in a reaction vessel and maintained at a temperature in the range from about 200.degree. C. to about 450.degree. C., and more preferably in the range of 280.degree.-360.degree. C. It is suitable to make HF gas continuously flow into and pass through the reaction vessel until the total quantity of HF flowed into the vessel amounts to 100 to 150% of the theoretical value for conversion of M.sub.4 P.sub.2 O.sub.7 or M.sub.2 HPO.sub.4 to M.sub.2 PO.sub.3 F.

REFERENCES:
patent: 2481807 (1949-09-01), Anderson
patent: 3401013 (1968-09-01), Rohifs et al.
patent: 3463605 (1969-08-01), White et al.
patent: 3821357 (1974-07-01), Cassidy et al.
Mosier et al, "Fluorine Chemicals"; Ind. Eng. Chem., vol. 43, pp. 246-248 (1951).

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