Citric Acid → Dicalcium silicate

HRID 2308143Notes

Reaction equation

HRID 2308143 reaction equation
[N+]([O-])([O-])=O.[Ca+2:5].[N+]([O-])([O-])=O.[Si:10]([O:20]CC)([O:17]CC)([O:14]CC)[O:11]CC.C(O)(=O)CC(CC(O)=O)(C(O)=O)O.[N+]([O-])([O-])=O.[NH4+].N.[N+]([O-])([O-])=O>C(O)C>[Si:10]([OH:20])([OH:17])([O-:14])[O-:11].[Ca+2:5].[Si:10]([O-:20])([O-:17])([O-:14])[O-:11].[Ca+2:5].[Ca+2:5].[Si:10]([O-:20])([O-:17])([O-:14])[O-:11].[Ca+2:5].[Ca+2:5].[Ca+2:5]

Participants

9

Reactant 5

HCID 311Citric AcidHCID 6517TetraethoxysilaneHCID 22985Ammonium nitrateHCID 24963Calcium nitrate2×HCID 21924274HCID 21924274, compound

Product 3

HCID 14941Dicalcium silicateHCID 20080352HCID 20080352, compoundHCID 86585631HCID 86585631, compound

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

Stoichiometric amounts of calcium nitrate (6.345 g) and Tetraethyl orthosilicate (3 ml) and citric acid (7.5292 g) were dissolved in ethyl alcohol (50 ml). To this solution sufficient quantity of ammonium nitrate was added to adjust the ammonia/nitrate content in the system. The beaker containing the solution was heated in a hot plate. Initially the solution boils and undergoes dehydration followed by decomposition leading to smooth deflation with enormous swelling, producing a foam. The foam then ignites and the product of combustion is voluminous and fluffy ultrafine powder of calcium silicates. Depending on the amount of calcium nitrate used we can get monocalcium silicate (CaSiO3), dicalcium silicate (Ca2SiO4) or tricalcium silicate (Ca3SiO5).

Workup

  1. additionThe beaker containing the solution
  2. temperaturewas heated in a hot plate
  3. customproducing a foam

Sources & evidence

ORD record
ord-f8a5c7b2c5044619825fc59a06a6c846
Source dataset
uspto-grants-2004_12
Patent number
US06835367B2

Reaction notes

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