Title:
PROCESS FOR PREPARING SYNTHETIC CLAY MINERALS
Document Type and Number:
WIPO Patent Application WO2001046071
Kind Code:
A3
Abstract:
The invention pertains to a process for preparing a synthetic caly mineral which comprises silicon, aluminium, and at least one octahedron ion, which clay mineral has a total content of sodium and potassium of less than 0.5 wt. %, comprising the steps of a) providing a silica-alumina with a total content of sodium and potassium of less than 2.0 wt. % b) combining the silica-alumina with an octahedron ion source in such a manner that less than 0.1 mole of the total of sodium or potassium is added per mole of octahedron ion, c) if necessary, adjusting the pH to a value of at least 7, with less than 0.1 mole of the total of sodium and potassium being added per mole of octahedron ion during the pH adjustement, d) aging the precipitate formed in c) at a temperature of 0-350 DEG C in an aqueous environment, e) optionally isolating the resulting material, optionally followed by washing. The invention makes it possible to prepare a saponite with a low content of sodium and potassium without an ion-exchange on the final material being necessary.
Inventors:
NIEMAN JAN
JANBROERS STEPHAN
JANBROERS STEPHAN
Application Number:
PCT/EP2000/013176
Publication Date:
May 10, 2002
Filing Date:
December 15, 2000
Export Citation:
Assignee:
AKZO NOBEL NV (NL)
International Classes:
B01J21/16; C01B33/40; B01J35/10; (IPC1-7): C01B33/40; B01J21/16
Domestic Patent References:
| WO1996007613A1 | 1996-03-14 |
Foreign References:
| US3803026A | 1974-04-09 | |||
| EP0605044A1 | 1994-07-06 |
Other References:
DECARREAU, ALAIN: "Crystallogenesis at low temperature of trioctahedral smectites by aging silico-metallic coprecipitates of formula: (Si(4-x)Alx)M2+3 O11.nH2O, where x changes from 0 to 1, and M2+ is Mg, Ni, Co, Zn, Fe, Cu, Mn", C. R. SEANCES ACAD. SCI., SER. 2 (1981), 292(1), 61-4, 1981, XP000907170
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