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Calcium pyrophosphate (Ca2P2O7) → Tricalcium Phosphate

HRID 983364
Notes
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Reaction equation

HRID 983364 reaction equation
O.O.[P:3]([O-:7])([O-:6])([O-:5])=[O:4].[Ca+2:8].[Ca+2].C1C2[C@@H]3C=C[C@H](C2C=C1)C3.[N+]([O-])([O-])=O.[Ca+2].[N+]([O-])([O-])=O.[O-:29][P:30]([O:33]P([O-])([O-])=O)(=[O:32])[O-:31].[Ca+2].[Ca+2]>OP([O-])([O-])=O.OP([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[Mg+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Fe+2]>[P:3]([O-:7])([O-:6])([O-:5])=[O:4].[Ca+2:8].[P:30]([O-:33])([O-:32])([O-:31])=[O:29].[Ca+2:8].[Ca+2:8]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 24632Calcium pyrophosphate (Ca2P2O7)HCID 24963Calcium nitrateHCID 15618652endo-Dicyclopentadiene2×HCID 21862903Dicalcium phosphate-dihydrate

Product 1

HCID 24456Tricalcium Phosphate

Reagents, catalysts & solvents 1

HCID 56841624
Whitlockite
Catalyst

Conditions

Temperature
500 °C

Procedure

Example 1 was repeated with the addition of 10.00 g dicalcium phosphate dihydrate, DCPD, CaHPO4.2H2O (Aldrich Chemical Co., Inc. #30,765-3, CAS #7789-77-7) to the homogeneous solution following endothermic dissolution of the calcium nitrate salt. The DCPD was present both as suspended solids and as precipitated material (no agitation used). Warming of the sample to >25° C. initiated an exothermic reaction as described in Example 1, resulting in the formation of a white, pasty solid. Heat treatment and X-ray diffraction of this solid were conducted as described in Example 1. Following heat treatment in air at 500° C. for 1 hour, XRD indicated the solid to be composed of whitlockite as the primary phase along with calcium pyrophosphate (Ca2P2O7) as the secondary phase.

Workup

  1. customas precipitated material (no agitation
  2. temperatureWarming of the sample to >25° C.
  3. customan exothermic reaction
  4. customresulting in the formation of a white, pasty solid
  5. temperatureHeat treatment and X-ray diffraction of this solid

Sources & evidence

ORD record
ord-ad6d58ab98fc47d1aad45128db1f9b85
Source dataset
uspto-grants-2005_03
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US06863899B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes