Phosphoric Acid → Dicalcium phosphate-dihydrate
Reaction equation
[P:1](=[O:5])([OH:4])([OH:3])[OH:2].[Ca:6]>>[OH2:2].[OH2:2].[P:1]([O-:5])([O-:4])([O-:3])=[O:2].[Ca+2:6].[Ca+2:6]Participants
3
Procedure
A process for producing crystalline platelets of anhydrous dicalcium phosphate which comprises adding an aqueous solution of phosphoric acid to an aqueous slurry of lime particles in proportions to provide a final pH below 5 and a calcium to PO4 ratio of about 1:1 and at a rate sufficient to enable a substantially complete reaction of said acid and lime particles while maintaining the temperature sufficiently low to form a slurry of dicalcium phosphate dihydrate particles and then heating said latter slurry at a temperature and for a period of time sufficient to convert said dihydrate particles to crystalline platelets of anhydrous dicalcium phosphate having a mass medium diameter of about 12 to 18 microns.
Workup
- customto provide a final pH below 5
- temperaturewhile maintaining the temperature sufficiently low
Sources & evidence
- ORD record
- ord-82331639632b45249100d469ab3f4bbd
- Source dataset
- uspto-grants-1988_01
- Patent number
- US04721615
Reaction notes
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