Pyrophosphoric acid → Dicalcium phosphate-dihydrate

HRID 1106224Notes

Reaction equation

HRID 1106224 reaction equation
[OH-].[Ca+2:2].[OH-].[P:4]([OH:8])([O-:7])([O-:6])=[O:5].[Ca+2].P(OP(O)(O)=O)(O)(O)=[O:11]>>[OH2:5].[OH2:11].[P:4]([O-:8])([O-:7])([O-:6])=[O:5].[Ca+2:2].[Ca+2:2]

Participants

4

Reactant 3

HCID 1023Pyrophosphoric acidHCID 24441Calcium hydrogen phosphateHCID 6093208Calcium Hydroxide2×

Product 1

HCID 21862903Dicalcium phosphate-dihydrate

Procedure

A quantity of dicalcium phosphate dihydrate was prepared as in Examples 1 and 2 except that the slaked lime slurry was added to the monocalcium phosphate solution until the pH reached about 5.6 and then pyrophosphoric acid was added until the pH was reduced to about 5.3; no further slaked lime slurry was added.

Sources & evidence

ORD record
ord-76b1bde9cc884e91b366aac97c77d11a
Source dataset
uspto-grants-1982_01
Patent number
US04312843

Reaction notes

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