Phosphinic Acid → Tricalcium Phosphate

HRID 1027332Notes

Reaction equation

HRID 1027332 reaction equation
O[PH2]=O.[P:4]([O-:8])([O-:7])([O-:6])=[O:5].[Ca+2:9].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].O.O.O.O.[N+]([O-])([O-])=O.[Ca+2].[N+]([O-])([O-])=O>>[P:4]([O-:8])([O-:7])([O-:6])=[O:5].[Ca+2:9].[P:4]([O-:8])([O-:7])([O-:6])=[O:5].[Ca+2:9].[Ca+2:9]

Participants

4

Reactant 3

HCID 4124402Phosphinic AcidHCID 16211656Calcium nitrate tetrahydrateHCID 21895894HCID 21895894, compound

Product 1

HCID 24456Tricalcium Phosphate

Procedure

An aqueous solution of 8.06 g 50 wt % H3PO2 reagent was combined with 6.00 g distilled water to form a clear, colorless solution in a 250 ml Pyrex beaker on a hotplate/stirrer. To this solution was added 19.23 g Ca(NO3)2.4H2O. The molar ratio of Ca/phosphate in this sample was 4/3 and the equivalent solids [as octacalcium phosphate, Ca8H2(PO4)66-5H2O] was 30.0 wt %. Endothermic dissolution of the calcium nitrate tetrahydrate proceeded under ambient conditions, eventually forming a homogeneous solution once the sample warmed to room temperature. Warming of the solution above 25° C. initiated a vigorous exothermic reaction as described in Example 1. After approximately three minutes, the reaction was essentially complete leaving a moist, white, pasty solid.

Workup

  1. distillationdistilled water
  2. customto form a clear, colorless solution in a 250 ml Pyrex beaker on a hotplate/stirrer
  3. customeventually forming a homogeneous solution once the sample
  4. temperatureWarming of the solution above 25° C.
  5. customa vigorous exothermic reaction
  6. customthe reaction was essentially complete leaving a moist, white, pasty solid

Sources & evidence

ORD record
ord-3bcb458431824293a4d6eea5e127db52
Source dataset
uspto-grants-2014_05
Patent number
US08734822B2

Reaction notes

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