Sulfuric Acid → Orthosilicic acid

HRID 1703745Notes

Reaction equation

HRID 1703745 reaction equation
O.O.O.O.O.[O-:6][Si:7]([O-:9])=[O:8].[Na+:10].[Na+].[S:12](=[O:16])(=[O:15])([OH:14])[OH:13]>>[Si:7]([OH:13])([OH:9])([OH:6])[OH:8].[S:12]([O-:16])([O-:15])(=[O:14])=[O:13].[Na+:10].[Na+:10]

Participants

4

Reactant 2

HCID 1118Sulfuric AcidHCID 61495Silicic acid (H2SiO3), disodium salt, pentahydrate

Product 2

HCID 14942Orthosilicic acidHCID 24436Sodium Sulfate

Procedure

About 150 parts by weight of sodium metasilicate pentahydrate are slowly added to about 75 parts by weight of concentrated sulfuric acid while agitating and keeping the temperature below 100° C. The reaction takes place under ambient pressure, and the reaction is complete in 1 to 2 hours, thereby producing a white granular silicic acid compound and sodium sulfate. The mixture is washed with water then filtered to remove the salt and water, thereby recovering the silicic acid compound. The silicic acid compound is air dried at 25° to 75° C.

Workup

  1. customthe temperature below 100° C

Sources & evidence

ORD record
ord-b8fc788504f341ea96aceb8d0a1e20ca
Source dataset
uspto-grants-1978_11
Patent number
US04125498

Reaction notes

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