Sodium Hydroxide → Sodium orthosilicate
Reaction equation
[O:1]=[Si]=O.[OH-].[Na+:5].[O-:6][Si:7]([O-:9])=[O:8].[Na+].[Na+]>>[Si:7]([O-:1])([O-:9])([O-:6])[O-:8].[Na+:5].[Na+:5].[Na+:5].[Na+:5]Participants
Procedure
EP 0 425 428 B1 likewise describes a process for the preparation of crystalline sodium silicates having a sheet structure and the aforementioned molar ratio and also a water content of less than 0.3% by weight from a water glass solution having at least 20% by weight of solids, which comprises obtaining the water glass solution by reacting quartz sand with sodium hydroxide solution, treating the water glass solution in a spray-drying zone at 200 to 300° C. and for a residence time of from 10 to 25 seconds, the temperature of the waste gas leaving the spray-drying zone being from 90 to 130° C., to form a pulverulent sodium silicate, which is then introduced into an inclined rotary kiln fitted with a solids agitation device and treated countercurrently with flue gas at temperatures of from 500 to 850° C. for a period of up to 60 minutes to form crystalline sodium silicate.
Workup
- customfor a residence time of from 10 to 25 seconds, the temperature of the waste gas leaving the spray-drying zone
- custombeing from 90 to 130° C.
Sources & evidence
- ORD record
- ord-961cd3e7eca8404298e2fe63326dcddc
- Source dataset
- uspto-grants-2000_03
- Patent number
- US06036733
Reaction notes
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