Sulfuric Acid → Phosphoric Acid

HRID 1277501Notes

Reaction equation

HRID 1277501 reaction equation
[S:1](=[O:5])(=[O:4])([OH:3])[OH:2].[P:6]([OH:10])([O-:9])([O-:8])=[O:7].[Ca+2:11]>>[OH2:2].[OH2:7].[S:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Ca+2:11].[P:6](=[O:7])([OH:10])([OH:9])[OH:8]

Participants

4

Reactant 2

HCID 1118Sulfuric AcidHCID 24441Calcium hydrogen phosphate

Product 2

HCID 1004Phosphoric AcidHCID 24928Calcium Sulfate Dihydrate

Procedure

adding sulfuric acid to the crystallization zone to react with at least the monocalcium phosphate to form calcium sulfate dihydrate and phosphoric acid, said crystallization slurry being maintained at a soluble sulfate concentration of from about +0.5% to about 3.0%, the soluble sulfate concentration of the crystallization slurry being at least 0.5% greater than the soluble sulfate concentration of the dissolving slurry;

Sources & evidence

ORD record
ord-c0ab240066be4244a8f4e7912b04132a
Source dataset
uspto-grants-1981_07
Patent number
US04277448

Reaction notes

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