Sulfuric Acid → Phosphoric Acid

HRID 1761830Notes

Reaction equation

HRID 1761830 reaction equation
[P:1]([OH:5])([O-:4])([O-:3])=[O:2].[Ca+2:6].[S:7](=[O:11])(=[O:10])([OH:9])[OH:8]>>[S:7]([O-:11])([O-:10])(=[O:9])=[O:8].[Ca+2:6].[P:1](=[O:2])([OH:5])([OH:4])[OH:3]

Participants

4

Reactant 2

HCID 1118Sulfuric AcidHCID 24441Calcium hydrogen phosphate

Product 2

HCID 1004Phosphoric AcidHCID 24497Calcium Sulfate

Procedure

The clarified solution is transferred to a vessel wherein the monocalcium phosphate is reacted with sulfuric acid to form calcium sulfate crystals and additional phosphoric acid. Preferably, the crystals are the gypsum form of calcium sulfate [CaSO4.2H2 ], however, they can alternately be of the hemi-hydrate [CaSO4.1/2H2O] form. The calcium sulfate crystals are removed from the phosphoric acid solution and a portion of the acid solution is recycled to the last coarse solids reaction zone of the process. The remainder of the phosphoric acid solution is removed as product from the process.

Workup

  1. customThe clarified solution is transferred to a vessel

Sources & evidence

ORD record
ord-4ed7053318bb4eb5a1d9ae5a2141ca9b
Source dataset
uspto-grants-1989_05
Patent number
US04828811

Reaction notes

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