Phosphoric Acid → Phosphorus oxide (P4O10)

HRID 1902601Notes

Reaction equation

HRID 1902601 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)

Product 1

HCID 14812Phosphorus oxide (P4O10)Yield 45%

Procedure

In the conventional methods 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 reaction product 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 slurry is filtered to separate most of the undissolved calcium sulfate and other solid impurities to yield a crude (22% P2O5 to 45% P2O5) aqueous product sometimes known as the number one filtrate. This filtrate 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. Reference is made to Chapter 16 of Volume II, Phosphorus and its Compounds, Van Wazer, Interscience Publishers (1961).

Workup

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

Sources & evidence

ORD record
ord-d545d30558c24e7e8088c663c385d19f
Source dataset
uspto-grants-1982_12
Patent number
US04364912

Reaction notes

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