Process for preparation of calcium hydrogen phosphate anhydride

Details Process for preparation of calcium hydrogen phosphate anhydride Process for preparation of calcium hydrogen phosphate anhydride

1976-01-28

1977-08-23

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423311, 23304, C01B 1516, C01B 2526

Patent

active

040441059

ABSTRACT:
An aqueous slurry of CaHPO.sub.4.2H.sub.2 O in a 5-20 Wt% concentration is prepared by the use of the phosphate dihydrate obtained by reaction of NaNH.sub.4 HPO.sub.4.4H.sub.2 O with CaCl.sub.2 in water. After adjustment of the pH of the slurry to 4.5-5.5, the slurry is rapidly heated to 85.degree.-97.degree. C by contact with steam to convert the dihydrate to the anhydride, which is suitable for use in the preparation of fluorescent materials due to its high purity, platy and square crystal shape and uniform particle size.

REFERENCES:
patent: 3095269 (1963-06-01), Chiola et al.
patent: 3395979 (1968-08-01), Schafer

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