Sulfuric Acid → Orthosilicic acid

HRID 596527Notes

Reaction equation

HRID 596527 reaction equation
[O-:1][Si:2]([O-:4])=[O:3].[Na+:5].[Na+].[S:7](=[O:11])(=[O:10])([OH:9])[OH:8]>O>[Si:2]([OH:8])([OH:4])([OH:1])[OH:3].[S:7]([O-:11])([OH:10])(=[O:9])=[O:8].[Na+:5]

Participants

5

Reactant 2

HCID 1118Sulfuric AcidHCID 23266Sodium Silicate2×

Product 2

HCID 14942Orthosilicic acidHCID 516919Sodium Bisulfate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

About 100 parts by weight of granular sodium metasilicate containing less than 6 mols of water per mol of sodium metasilicate is slowly added to 100 parts by weight of concentrated sulfuric acid while agitating and keeping the temperature below 100° C. The chemical reaction is complete in 1 to 2 hours, thereby producing a white granular silicic acid compound and sodium hydrogen sulfate. The mixture is washed with water, filtered to remove the sodium hydrogen sulfate and recover the white granular silicic acid compound. The silicic acid compound is air dried at 25° to 75° C by blowing air thru the granules.

Workup

  1. customthe temperature below 100° C
  2. customThe chemical reaction

Sources & evidence

ORD record
ord-0f1ab60b8264415abc98f8cd75c14187
Source dataset
uspto-grants-1977_03
Patent number
US04011253

Reaction notes

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