Ammonia → Tricalcium Phosphate

HRID 1851871Notes

Reaction equation

HRID 1851871 reaction equation
[N+:1]([O-:4])([O-:3])=[O:2].[Ca+2:5].[N+:6]([O-:9])([O-:8])=[O:7].[P:10]([O-:14])([O-:13])([OH:12])=[O:11].[NH4+:15].[NH4+].N>O>[N+:1]([O-:4])([O-:3])=[O:2].[Ca+2:5].[N+:6]([O-:9])([O-:8])=[O:7].[P:10]([O-:14])([O-:13])([OH:12])=[O:11].[NH4+:15].[NH4+:1].[P:10]([O-:14])([O-:13])([O-:12])=[O:11].[Ca+2:5].[P:10]([O-:14])([O-:13])([O-:12])=[O:11].[Ca+2:5].[Ca+2:5]

Participants

7

Reactant 3

HCID 222AmmoniaHCID 24540Diammonium hydrogen phosphate2×HCID 24963Calcium nitrate2×

Product 3

HCID 24456Tricalcium PhosphateHCID 24540Diammonium hydrogen phosphateHCID 24963Calcium nitrate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

HAP-2 (Ca/P=1.65) catalysts were prepared by the precipitation method. Analytical grade calcium nitrate [Ca(NO3)2] and diammonium hydrogen phosphate [(NH4)2HPO4] was used for preparation of catalyst. Calcium nitrate solution (40.12 g in 125 ml water) and diammonium hydrogen phosphate solutions (13.60 g in 125 ml water) were prepared in deionised water. Ammonia gas was passed in both the solutions till pH 10. The calcium nitrate solution was added drop wise with constant stirring to the solution of diammonium hydrogen phosphate. A thick white precipitate of calcium phosphate was formed which was filtered, washed and dried in an oven at 150° C. for 8 hr. The dried calcium phosphate was calcined at 600° C. for four hours to yield 9.7 g catalyst.

Workup

  1. customHAP-2 (Ca/P=1.65) catalysts were prepared by the precipitation method

Sources & evidence

ORD record
ord-46cbcbf1d5ae47e19c82ff90fe0dc39d
Source dataset
uspto-grants-2015_02
Patent number
US08957250B2

Reaction notes

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