Phosphoric Acid → Tricalcium Phosphate

HRID 2223002Notes

Reaction equation

[O-:1][P:2]([O-:5])([O-:4])=[O:3].[O-:6][P:7]([O-:10])([O-:9])=[O:8].[O-]P([O-])([O-])=O.[F-].[Ca+2:17].[Ca+2].[Ca+2].[Ca+2].[Ca+2].P(=O)(O)(O)O>>[P:2]([O-:5])([O-:4])([O-:3])=[O:1].[Ca+2:17].[P:7]([O-:10])([O-:9])([O-:8])=[O:6].[Ca+2:17].[Ca+2:17]

Participants

Reactant 2

HCID 1004Phosphoric Acid

HCID 10207414Fluorapatite (Ca5F(PO4)3)

Product 1

HCID 24456Tricalcium Phosphate

Procedure

In Reaction 1a, the phosphate rock is first reacted with phosphoric acid to produce monobasic calcium phosphate (monocal) slurry. Then, in Reaction 1b, the monobasic calcium phosphate slurry is reacted with sulfuric acid to produce phosphoric acid and calcium sulfate dihydrate (gypsum). Filtration is used to separate gypsum.

Sources & evidence

ORD record: ord-299634c98cea4c5ea5efe4908b1c2dd0
Source dataset: uspto-grants-2008_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07374740B2

Reaction notes

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