Calcium Sulfate Dihydrate → Calcium Sulfate, Hemihydrate

HRID 2287276Notes

Reaction equation

HRID 2287276 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

This chemical reaction indicates that calcium sulfate dihydrate plus heat yields calcium sulfate hemihydrate plus water vapor. This process is conducted in a "calciner," several types of which are known in the art (e.g., a calcidyne calciner). A flash calcination impact mill is an apparatus for simultaneously drying, grinding, and calcining gypsum.

Workup

  1. customThis chemical reaction
  2. temperatureheat

Sources & evidence

ORD record
ord-30cf64d9d0094599a11c98a1623d828e
Source dataset
uspto-grants-2000_07
Patent number
US06083465

Reaction notes

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