Calcium Carbonate → Tetracalcium phosphate

HRID 1452435Notes

Reaction equation

HRID 1452435 reaction equation
[OH:1][P:2]([O-:5])([O-:4])=[O:3].[Ca+2:6].C(=O)([O-])[O-].[Ca+2]>>[P:2]([O-:5])([O-:4])([O-:3])=[O:1].[Ca+2:6].[Ca+2:6].[Ca+2:6].[Ca+2:6]

Participants

3

Reactant 2

HCID 10112Calcium CarbonateHCID 24441Calcium hydrogen phosphate

Product 1

HCID 18676510Tetracalcium phosphate

Procedure

Cement preparation: TTCP (tetracalcium phosphate) was prepared by sintering an equimolar mixture of DCPA (dicalcium phosphate anhydrous) (Baker) and calcium carbonate (Baker) at 1500° C. for 18 h followed by quenching in air, followed by milling in agate jars to a d50 of 15 μm. DCPA was milled in 96% ethanol by means of a ball mill for 24 h to a d50 of 0.7 μm. TTCP and DCPA were mixed at a nearly equimolar ratio (0.91), weight ratio 7:3 in a ball mill for 1 h. 0.97 weight % of dry sodium phosphate accelerator was mixed with the cement to adjust the initial setting time according to the Gilmore-needle test to about 5 min at 37° C.

Workup

  1. customCement preparation
  2. customby quenching in air
  3. customDCPA was milled in 96% ethanol by means of a ball mill for 24 h to a d50 of 0.7 μm
  4. additionTTCP and DCPA were mixed at a nearly equimolar ratio (0.91), weight ratio 7:3 in a ball mill for 1 h
  5. addition0.97 weight % of dry sodium phosphate accelerator was mixed with the cement

Sources & evidence

ORD record
ord-b174f31f36874a1b8fb0e1b82f7973e7
Source dataset
uspto-grants-2009_01
Patent number
US07473312B2

Reaction notes

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