Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1992-06-02
1994-10-18
Chaudhuri, Olik
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
252135, C01B 3332
Patent
active
053566076
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.
REFERENCES:
patent: 2881049 (1959-04-01), Erbe et al.
patent: 3537815 (1970-11-01), Burke
patent: 4336235 (1982-06-01), Deabriges
patent: 4770866 (1988-09-01), Christophliemk
Benecke & Lagaly, American Minerals, 62, 1977, pp. 763-771.
Chaudhuri Olik
Henkel Kommanditgesellschaft auf Aktien
Horton Ken
Jaeschke Wayne C.
Szoke Ernest G.
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