Fremgangsmåde til den hydrotermale fremstilling af krystallinsk natriumdisilikat

This invention is a process for the hydrothermal preparation of sodium disilicate with a molar ratio of Na2O:SiO2 of 1:2 at an elevated temperature and a pressure corresponding to said temperature in a pressure vessel, characterized in that quartz sand and caustic soda solution and/or an aqueous sol...

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Bibliographic Details
Main Author JUST, GUENTHER
Format Patent
LanguageDanish
Published 13.02.1995
Edition5
Subjects
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Summary:This invention is a process for the hydrothermal preparation of sodium disilicate with a molar ratio of Na2O:SiO2 of 1:2 at an elevated temperature and a pressure corresponding to said temperature in a pressure vessel, characterized in that quartz sand and caustic soda solution and/or an aqueous solution of amorphous sodium disilicate at a total solids concentration of from 50 to 75% by weight are heated to at least 235 DEG C. in a first step, the concentration may be increased in an optional second step by removing water from the reaction mixture, in a third step, dependent on whether the second step has been carried out, the amount of water removed in the second step is completely or partially added again to the mixture during or immediately after same has been cooled to from 90 DEG C. to 130 DEG C., and then the obtained crystalline sodium disilicate is recovered.
Bibliography:Application Number: DK19900917667T