Phosphoric Acid → Phosphoric Acid

HRID 981883Notes

Reaction equation

HRID 981883 reaction equation
[OH:1]P(O)(O)=O.[O:6]=[P:7]12[O:18]P3(OP(OP(O3)([O:14]1)=O)(=O)[O:8]2)=O.P([O-])([O-])([O-])=O.[Ca+2:25].P([O-])([O-])([O-])=O.[Ca+2].[Ca+2].[S:33](=[O:37])(=[O:36])([OH:35])[OH:34]>>[OH2:1].[S:33]([O-:37])([O-:36])(=[O:35])=[O:34].[Ca+2:25].[Ca+2:25].[S:33]([O-:37])([O-:36])(=[O:35])=[O:34].[P:7](=[O:6])([OH:18])([OH:14])[OH:8]

Participants

6

Reactant 4

HCID 1004Phosphoric Acid2×HCID 1118Sulfuric AcidHCID 14812Phosphorus oxide (P4O10)HCID 24456Tricalcium Phosphate

Product 2

HCID 1004Phosphoric AcidHCID 3033839Calcium Sulfate, Hemihydrate

Procedure

Superphosphoric acid (SPA), which is used in the manufacture of fertilizers, is phosphoric acid containing about 68 to about 70% by weight of P2O5. It can be manufactured by dissolving calcium phosphate rock with sulfuric acid, producing a slurry of calcium sulfate hemihydrate in a solution of phosphoric acid. The slurry is filtered and the calcium sulfate hemihydrate filter cake is discarded. The filtered acid is evaporated to about 48% P2O5 for further purification.

Sources & evidence

ORD record
ord-fae809bf43444268aaf4af06b8409a02
Source dataset
uspto-grants-1991_02
Patent number
US04994248

Reaction notes

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