Phosphoric Acid → Carbon Dioxide

HRID 1277499Notes

Reaction equation

HRID 1277499 reaction equation
P(=O)(O)(O)O.[S:6](=[O:10])(=[O:9])([OH:8])[OH:7].[C:11](=O)([O-:13])[O-:12].[Ca+2:15]>[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2]>[S:6]([O-:10])([O-:9])(=[O:8])=[O:7].[Ca+2:15].[C:11](=[O:13])=[O:12]

Participants

6

Reactant 3

HCID 1004Phosphoric Acid2×HCID 1118Sulfuric Acid2×HCID 10112Calcium Carbonate

Product 2

HCID 280Carbon DioxideHCID 24497Calcium Sulfate

Reagents, catalysts & solvents 1

HCID 10207414Fluorapatite (Ca5F(PO4)3)Solvent2×

Procedure

FIG. 4 shows another version of the present invention wherein the dissolving zone comprises two vessels. In this version, wet screened phosphate rock 60 is transferred to a rock reslurry tank 62 where it is mixed with recycled phosphoric acid 64 which contains free sulfuric acid. In this tank 62, calcium carbonate in phosphate rock reacts with free sulfuric acid in the recycle phosphoric acid forming calcium sulfate and carbon dioxide, and raising the slurry temperature to approximately 70° C. Practically all of the carbon dioxide formed is removed in this tank via vent 66. Defoamer 68 is added to the tank 62 as needed to control foaming. The rock reslurry tank can have a capacity, for example, of 17,200 gallons, and is equipped with an agitator 69.

Sources & evidence

ORD record
ord-edc8159a1b0347ecbefe6c6cfc384b64
Source dataset
uspto-grants-1981_07
Patent number
US04277448

Reaction notes

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