Process for the preparation of crystalline sheet-type alkali...

Details Process for the preparation of crystalline sheet-type alkali... Process for the preparation of crystalline sheet-type alkali...

C - Chemistry, Metallurgy

01

B

23/189

C01B 33/32 (2006.01) C01B 33/12 (2006.01) C01B 33/38 (2006.01)

Patent

CA 1220612

Abstract of the Disclosure: A process for the preparation of a crystalline sheet-type alkali metal silicate in an aqueous medium is described, in which an acidic compound is added to an amorphous alkali metal silicate, or an alkali metal sili- cate dissolved in water, having a molar ratio M2O/SiO2 (M = alkali metal) of 0.24 to 2.0, in an amount such that a molar ratio M2O (unneutralized)/SiO2 of 0.05 to 0.239 is obtained. If required, the molar ratio SiO2/ H2O is adjusted from 1:5 to 1:100 by dilution, and the reaction mixture is kept at a reaction temperature of 70 to 250°C until the sheet-type alkali metal silicate has crystallized out.

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