Process for the hydrothermal production of crystalline sodium disilicate
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United States of America Patent
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Oct 18, 1994
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N/A
app pub date -
Jun 2, 1992
filing date -
Dec 2, 1989
priority date (Note) -
Expired
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Abstract
This invention is a process for the hydrothermal preparation of sodium disilicate with a molar ratio of Na.sub.2 O:SiO.sub.2 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.degree. 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.degree. C. to 130.degree. C., and then the obtained crystalline sodium disilicate is recovered.
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