Phosphoric Acid → Phosphorus oxide (P4O10)

HRID 370604Notes

Reaction equation

HRID 370604 reaction equation
[O-:1][P:2]([O-:5])([O-:4])=[O:3].[O-][P:7]([O-:10])([O-:9])=[O:8].[O-][P:12]([O-:15])([O-])=[O:13].[F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[P:22](=O)(O)(O)[OH:23]>O>[O:3]=[P:2]12[O:5][P:7]3([O:10][P:12]([O:15][P:22]([O:9]3)([O:4]1)=[O:23])(=[O:13])[O:1]2)=[O:8]

Participants

4

Reactant 2

HCID 1004Phosphoric AcidHCID 10207414Fluorapatite (Ca5F(PO4)3)

Product 1

HCID 14812Phosphorus oxide (P4O10)

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

The above objects are provided by a continuous slurry process for the production of granulated fertilizers comprising the steps of (a) continuously introducing into a pre-reactor comminuted phosphate rock, phosphoric acid in an amount sufficient to provide a ratio of P2O5 to CaO of 0.7 to 1.0 and water in an amount sufficient to dilute the phosphoric acid to not less than 38%, (b) heating the mixture with continuous agitation, while (c) continuously transferring the mixture to a digester, (d) heating the mixture in the digester with agitation for a length of time sufficient to form a slurry, while, (e) continuously withdrawing slurry as an overflow stream, (f) splitting the withdrawn slurry stream into two streams, (g) recycling one stream to the pre-reactor or to the digester, (h) delivering the other stream to a granulator and mixing with other dry fertilizer ingredients, thereby producing fertilizer granules, and (i) drying the granules.

Workup

  1. customThe above objects are provided by a continuous slurry process for the production of granulated fertilizers
  2. additioncontinuously introducing into a pre-reactor

Sources & evidence

ORD record
ord-c99ee8bdc27443ceba1a7bda2339432e
Source dataset
uspto-grants-1985_07
Patent number
US04528021

Reaction notes

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