Calcium Sulfate Dihydrate → Calcium Sulfate, Hemihydrate

HRID 1365569Notes

Reaction equation

HRID 1365569 reaction equation
O.O.[S:3]([O-:7])([O-:6])(=[O:5])=[O:4].[Ca+2:8]>O>[OH2:4].[S:3]([O-:7])([O-:6])(=[O:5])=[O:4].[Ca+2:8].[Ca+2:8].[S:3]([O-:7])([O-:6])(=[O:5])=[O:4]

Participants

3

Reactant 1

HCID 24928Calcium Sulfate Dihydrate

Product 1

HCID 3033839Calcium Sulfate, Hemihydrate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

When calcium sulfate dihydrate is heated sufficiently, a process called calcining, the water of hydration is driven off and there can be formed either calcium sulfate hemihydrate (CaSO4 ½ H2O) or calcium sulfate anhydrite (CaSO4) depending on the temperature and duration of exposure. The term “calcined gypsum.” as used herein, refers to both the hemihydrate and anhydrite forms of calcium sulfate.

Sources & evidence

ORD record
ord-928e570805dd47c48968a06da78e0c56
Source dataset
uspto-grants-2011_02
Patent number
US07892472B2

Reaction notes

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