Phosphoric Acid → Tricalcium Phosphate

HRID 1576669Notes

Reaction equation

HRID 1576669 reaction equation
[Cl-].[Cl-].[Ca+2:3].[P:4](=[O:8])([OH:7])([OH:6])[OH:5].FF.[Na+].[Cl-]>O>[P:4]([O-:8])([O-:7])([O-:6])=[O:5].[Ca+2:3].[P:4]([O-:8])([O-:7])([O-:6])=[O:5].[Ca+2:3].[Ca+2:3]

Participants

6

Reactant 4

HCID 1004Phosphoric AcidHCID 5234Sodium ChlorideHCID 24524FluorineHCID 5284359Calcium Chloride

Product 1

HCID 24456Tricalcium Phosphate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
320 fahrenheit

Procedure

An aqueous solution of calcium dichloride was mixed with phosphoric acid of high fluorine content to produce a solution having a Ca/P mole ratio of 0.8 and a solution P/F ratio of about 20. The solution was treated with NaCl and chilled to produce a precipitate in accordance with the procedure of Example 1(a). The slurry was filtered yielding a filtrate having a Ca/P mole ratio of 0.8 and a P/F ratio of about 60. The solution was then fed to a conventional spray dryer at a rate of about 125 ml./min., with the exit gas temperature of the dryer being maintained at about 320°F. The dried product had a P/F ratio in excess of 100 and comprised a mixture of CaHPO4, CaClH2PO4 . H2O, and Ca(H2PO4)2.

Workup

  1. customto produce a solution
  2. temperaturechilled
  3. customto produce a precipitate in accordance with the procedure of Example 1(a)
  4. filtrationThe slurry was filtered
  5. customyielding a filtrate

Sources & evidence

ORD record
ord-c51f153ca85c425bac6ff8a09a899bf1
Source dataset
uspto-grants-1976_09
Patent number
US03982008

Reaction notes

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