Calcium Sulfate Dihydrate → Calcium Sulfate, Hemihydrate

HRID 254117

Reaction equation

HRID 254117 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

Gypsum building panels offer a high performance product for a reasonable price for finishing of building spaces. Gypsum, also known as calcium sulfate dihydrate, is heated to drive off crystalline water to produce calcium sulfate anhydrite and/or calcium sulfate hemihydrate, also known as stucco, calcined gypsum or Plaster of Paris. The building panels are made by combining dry stucco with water. Calcined gypsum and water are combined and an interlocking matrix of gypsum crystals is formed. After the hydration of the calcined gypsum, excess water is driven off by heating, the resulting product is a relatively strong panel, having a good surface for receiving decorative finishes such as paint or wallpaper.

Workup

  1. temperatureis heated

Sources & evidence

ORD record
ord-32bdb438145644a78e5467bb43c702d1
Source dataset
uspto-grants-2011_01
Patent number
US07875114B2

Linked notes

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