Process for the preparation of crystalline sodium disilicates

• Main Authors: MICHAEL KOTZIAN, GUENTHER SCHIMMEL, ALEXANDER TAPPER, KNUT BAUER
• Format: Patent
• Language: English
• Published: 24.06.1993
• Edition: 5
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

In order to prepare crystalline sodium disilicates having a sheet structure, a molar ratio of SiO2 to Na2O of (from 1.9 to 2.1):1 and a water content of less than 0.3% by weight, a water glass solution is first obtained by reacting sand with aqueous sodium hydroxide in a molar ratio SiO2 to Na2O of...