Water → Sodium orthosilicate
Reaction equation
[O-:1][Si:2]([O-:4])=[O:3].[Na+:5].[Na+].[OH2:7]>>[Si:2]([O-:7])([O-:4])([O-:1])[O-:3].[Na+:5].[Na+:5].[Na+:5].[Na+:5]Participants
3
Reactant 2
Product 1
Procedure
300 ml of sodium water glass was mixed with 2700 ml of de-ionized water to form an aqueous solution of sodium silicate, which was passed through a cationic exchange resin column, thereby forming silicic acid. 5 wt % aqueous KOH was added gradually at a temperature below 80° C. (preferably, 70-80° C.) until the pH value of the aqueous solution was greater than 10 so that the silicic acid was alkalized and underwent polycondensation. The reaction product was cooled to 40° C., and was added with 300 ml of 10 wt % sodium aluminate aqueous solution. After 40 minutes, the reaction product was passed through a cationic exchange resin column to obtain a clear silica sol A.
Sources & evidence
- ORD record
- ord-636a6c8100af4104aeaf2017499c92cc
- Source dataset
- uspto-grants-2013_10
- Patent number
- US08557006B2
Reaction notes
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