Calcium Sulfate → Calcium Sulfate, Hemihydrate

HRID 1716162Notes

Reaction equation

HRID 1716162 reaction equation
[S:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Ca+2:6]>O>[OH2:2].[S:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Ca+2:6].[Ca+2:6].[S:1]([O-:5])([O-:4])(=[O:3])=[O:2]

Participants

3

Reactant 1

HCID 24497Calcium Sulfate2×

Product 1

HCID 3033839Calcium Sulfate, Hemihydrate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent4×

Procedure

During the reaction, more water, in addition to what is needed for solification, is needed for stirring thoroughly reactants. The more water adds into, the much time of solification needs. After the reaction completes, excess of water still remained inside the structure of calcium sulfate distills into vapors and voids form accordingly. Therefore, the more water adds in, the weaker of the structural strength of calcium sulfate becomes. Calcium sulfate hemihydrate is obtained by dehydrating calcium sulfate dihydrate by heat. Calcium sulfate hemihydrate with inherent humidity-absorbance can be used to control the crystallization of calcium sulfate dihydrate reduced from calcium sulfate hemihydrate to get stronger products. Calcium sulfate hemihydrate can be divided into a, (3 types of hemi-calcium sulfates according to its physical properties.

Workup

  1. additionin addition to what
  2. distillationdistills into vapors and voids
  3. customform accordingly

Sources & evidence

ORD record
ord-381c29f5c10a469685b4651bb2c97989
Source dataset
uspto-grants-2010_09
Patent number
US07803396B2

Reaction notes

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