Phosphoric Acid → Tricalcium Phosphate

HRID 973358Notes

Reaction equation

C([O-])([O-])=O.[Ca+2:5].[OH:6][P:7]([OH:10])([OH:9])=[O:8]>>[P:7]([O-:10])([O-:9])([O-:8])=[O:6].[Ca+2:5].[P:7]([O-:10])([O-:9])([O-:8])=[O:6].[Ca+2:5].[Ca+2:5]

Participants

Reactant 2

HCID 1004Phosphoric Acid

HCID 10112Calcium Carbonate

Product 1

HCID 24456Tricalcium Phosphate

Procedure

Twenty kilograms of CaCO3 was mixed with 44 kg of H3PO4 (89%) and the resulting mixture was fired at 1,300° C. for 2 hours. The atomic Ca/P ratio in the fired product was about 0.5. The fired product was ground into a powder so that the particles of 5 μm or greater in size would be 40% on trommel. The powder was put into a 1% aqueous solution of methyl cellulose and stirred to form a calcium phosphate slurry. The previously prepared base material was immersed in the slurry and thereafter dried and fired in air atmosphere at 700° C. to have the surface of the base material covered with the first layer of calcium phosphate.

Sources & evidence

ORD record: ord-e428113040bb49908ebc2bcd6a91e710
Source dataset: uspto-grants-1991_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05062798

Reaction notes

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