Calcium Sulfate Dihydrate → Calcium Sulfate, Hemihydrate

HRID 346405

Reaction equation

HRID 346405 reaction equation
O.O.[O-:3][S:4]([O-:7])(=[O:6])=[O:5].[Ca+2:8]>O>[OH2:3].[S:4]([O-:7])([O-:6])(=[O:5])=[O:3].[Ca+2:8].[Ca+2:8].[S:4]([O-:7])([O-:6])(=[O:5])=[O:3]

Participants

3

Reactant 1

HCID 24928Calcium Sulfate Dihydrate2×

Product 1

HCID 3033839Calcium Sulfate, Hemihydrate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

The calcination (or dehydration) step in the manufacture of stucco is performed by heating the land plaster, and generally can be described by the following chemical equation which shows that heating calcium sulfate dihydrate yields calcium sulfate hemihydrate (stucco) and water vapor: CaSO4.2H2O+heat#CaSO4.½H2O+1 ½H2O.

Sources & evidence

ORD record
ord-6e633223498d4bff9b206e572e6a7b68
Source dataset
uspto-grants-2007_02
Patent number
US07172403B2

Linked notes

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