Phosphoric Acid → Phosphorus oxide (P4O10)

HRID 325601Notes

Reaction equation

HRID 325601 reaction equation
[P:1](=[O:5])([OH:4])([OH:3])[OH:2].[O-][P:7]([O-:10])([O-:9])=[O:8].[O-][P:12]([O-:15])([O-])=[O:13].[O-:16][P:17]([O-])([O-])=O.[F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].S(=O)(=O)(O)O>>[O:5]=[P:1]12[O:4][P:7]3([O:10][P:12]([O:15][P:17]([O:9]3)([O:3]1)=[O:16])(=[O:13])[O:2]2)=[O:8]

Participants

4

Reactant 3

HCID 1004Phosphoric Acid2×HCID 1118Sulfuric AcidHCID 10207414Fluorapatite (Ca5F(PO4)3)2×

Product 1

HCID 14812Phosphorus oxide (P4O10)Yield 33%

Procedure

A conventional method for the production of wet process phosphoric acid, finely ground phosphate rock is reacted with dilute phosphoric acid (10% P2O5 to 25% P2O5) and sulphuric acid which may or may not be diluted. The phosphate rock is leached (i.e., digested or reacted with the acid) to yield a crude aqueous phosphoric acid solution in which is suspended a substantial quantity of solid impurities. This solution is filtered to separate out most of the undissolved gypsum and other solid impurities to yield a crude (26% P2O5 to 33% P2O5) aqueous product also known as the No. 1 filtrate. This filtrate still contains suspended, finely divided, impurities that were not removed during the solid liquid separation step plus solids that have crystallized after filtration. The solution also contains dissolved impurities.

Workup

  1. additionbe diluted
  2. customdigested or reacted with the acid)
  3. customto yield a crude aqueous phosphoric acid solution in which
  4. filtrationThis solution is filtered
  5. customto separate out most of the undissolved gypsum and other solid impurities

Sources & evidence

ORD record
ord-62d9efc0774146149975c421da9109f8
Source dataset
uspto-grants-1984_04
Patent number
US04442081

Reaction notes

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