Method of making high purity calcium hydrogen phosphate dihydrat

Details Method of making high purity calcium hydrogen phosphate dihydrat Method of making high purity calcium hydrogen phosphate dihydrat

1981-04-27

1982-09-14

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2532

Patent

active

043495184

ABSTRACT:
A continuous process for manufacture of brushite, CaHPO.sub.4.2H.sub.2 O, is disclosed. Calcium and phosphate ions are mixed in a container to produce brushite precipitate, which is then continuously introduced into second and third containers where the pH is raised to reduce brushite solubility. The brushite is then filtered in a continuous process, washed, refiltered, and rewashed before being converted to anhydrous calcium hydrogen phosphate.

REFERENCES:
patent: 3294486 (1966-12-01), Cremer et al.
patent: 3395979 (1968-08-01), Schafer
patent: 3505012 (1970-04-01), Dale et al.
patent: 3509070 (1970-04-01), Lapidus
patent: 4178355 (1979-12-01), Heytmeijer et al.

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