Production of dicalcium phosphate or monocalcium phosphate from calcium phosphate
OwnerJan C. De Waalinventor
Life of this patent
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Abstract
A method of producing dicalcium phosphate from calcium phosphate includes reacting the calcium phosphate with a mineral acid such as sulphuric acid to produce a calcium salt and phosphoric acid. The calcium salt may then be hydrolyzed to form a calcium alkali which may then be reacted with the phosphoric acid to produce dicalcium phosphate. Also, a method of producing monocalcium phosphate from calcium phosphate includes reacting the calcium phosphate with sulphuric acid to produce monocalcium phosphate. The monocalcium phosphate may be further processed to remove fluorine contamination and to produce fluorine-free dicalcium phosphate or dicalcium phosphate dihydrate.
Claims9
A method for the manufacture of dicalcium phosphate from calcium phosphate comprising:
- (a) reacting the calcium phosphate with a suitable mineral acid to form the corresponding calcium salt and phosphoric acid;
- (b) hydrolyzing the calcium salt of step (a) to form the corresponding calcium alkali and the mineral acid of step (a) or its salt;
- (c) where the salt of the mineral acid is formed in step (b), electrolyzing such salt to form the corresponding mineral acid together with an alkali;
- (d) recycling the mineral acid of steps (b) or (c) to step (a);
- and
- (e) reacting the calcium alkali of step (b) with the phosphoric acid of step (a) to form dicalcium phosphate.
Dependencies are inferred from the claim text.