Process for the preparation of crystalline sodium silicates

Details Process for the preparation of crystalline sodium silicates Process for the preparation of crystalline sodium silicates

1985-05-09

1986-04-29

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423332, C01B 3332

Patent

active

045856427

ABSTRACT:
A process for the preparation of crystalline sodium silicates with a molar ratio SiO.sub.2 /Na.sub.2 O of 1.9:1 to 3.5:1 from amorphous sodium silicate is described. To water-containing amorphous sodium silicate with a molar ratio SiO.sub.2 /Na.sub.2 O of 1.7:1 to 3.75:1 and a water content of 5 to 95% by weight is added 0.01 to 30 parts by weight of the crystalline sodium silicate to be prepared (per 100 parts by weight of Na.sub.2 O+SiO.sub.2 in the water-containing amorphous sodium silicate).
The reaction mixture is dehydrated by heating. The dehydrated reaction mixture is kept at a temperature of at least 450.degree. C., but below the melting point, until the sodium silicate has crystallized.

REFERENCES:
patent: 2795485 (1957-06-01), Manchot
patent: 3377134 (1968-04-01), Baker et al.

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