| US 7,553,462 B2 | ||
| Method for the production of Mg (OH)2 nanoparticles | ||
| Claus Feldmann, Ettlingen (Germany); Sascha Ahlert, Dortmund (Germany); Jörg-Heino Sachse, Kassel (Germany); and Ingo Stahl, Vellmar (Germany) | ||
| Assigned to K&S Aktiengesellschaft, Kassel (Germany) | ||
| Filed on Jun. 18, 2007, as Appl. No. 11/820,182. | ||
| Claims priority of application No. 10 2006 027 915 (DE), filed on Jun. 17, 2006. | ||
| Prior Publication US 2008/0181844 A1, Jul. 31, 2008 | ||
| Int. Cl. B01J 21/10 (2006.01); C01F 5/02 (2006.01); C01F 5/08 (2006.01); C01F 5/14 (2006.01); C01F 5/20 (2006.01); C01F 5/22 (2006.01) | ||
| U.S. Cl. 423—164 [423/158; 423/635; 423/636; 423/639; 423/647; 502/340; 977/811] | 21 Claims |
| 1. A method for the production of Mg(OH)2 nanoparticles, by means of polyol-mediated synthesis, from MgCl2 or Mg(NO3)2 or Mg(CH3COO)2 or their hydrates or aqueous solutions of these salts as Mg precursors, and alkali metal hydroxide selected from the group
of NaOH, KOH, LiOH or quaternary ammonium hydiboxide (NR4OH with R═CR3, C2H5, C3H7, C4H9) or metal alcoholates, comprising the following method steps:
dissolving the Mg precursor in a selected polyol, in order to produce a first solution;
producing a second solution in the form of an aqueous alkali metal hydroxide solution mixed with polyol or an aqueous quaternary
ammonium hydroxide solution mixed with polyol or metal alcoholates mixed with polyol;
adding the first solution to the second solution to produce a mixture;
stirring the mixture;
heating the mixture in one-stage or many stages to a temperature between 30° C. and 300° C;
cooling a Mg (OH)2 product suspension formed to ambient temperature; and
separating solid from the suspension by means of a suitable solid/liquid separation method.
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