Sulfuric Acid → Phosphoric Acid

HRID 2223003Notes

Reaction equation

[P:1]([O-:5])([O-:4])([O-:3])=[O:2].[Ca+2:6].P([O-])([O-])([O-])=[O:8].[Ca+2].[Ca+2].[S:14](=[O:18])(=[O:17])([OH:16])[OH:15]>>[P:1](=[O:2])([OH:5])([OH:4])[OH:3].[OH2:8].[OH2:15].[S:14]([O-:18])([O-:17])(=[O:16])=[O:15].[Ca+2:6]

Participants

Reactant 2

HCID 1118Sulfuric Acid

HCID 24456Tricalcium Phosphate

Product 2

HCID 1004Phosphoric Acid

HCID 24928Calcium Sulfate Dihydrate

Procedure

In Reaction 1a, the phosphate rock is first reacted with phosphoric acid to produce monobasic calcium phosphate (monocal) slurry. Then, in Reaction 1b, the monobasic calcium phosphate slurry is reacted with sulfuric acid to produce phosphoric acid and calcium sulfate dihydrate (gypsum). Filtration is used to separate gypsum.

Sources & evidence

ORD record: ord-b33fab6c35ce408d9b895401e26fc445
Source dataset: uspto-grants-2008_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07374740B2

Reaction notes

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