C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
C03B 19/12 (2006.01) C03B 20/00 (2006.01) C03C 1/00 (2006.01) C03C 3/06 (2006.01)
Patent
CA 2600662
Process for the production of monoliths by means of the sol-gel process, comprising the following steps: a. hydrolysis of an alkoxide in aqueous solution to form a hydrolysate and optionally evaporation to optimum concentration of the same, b. addition of an oxide prepared by the pyrogenic route, c. mixing of the hydrolysate of the alkoxide with the oxide prepared by the pyrogenic route to form a colloidal sol, d. optional removal of coarse contents from the colloidal sol, e. gelling of the colloidal sol in a mould, f. optional replacement of the water contained in the resulting aerogel by an organic solvent, g. drying of the aerogel, h. heat treatment of the dried aerogel, the coarse content being removed from the colloidal sol.
Procédé de fabrication de monolithes au moyen d~un procédé sol-gel, comprenant les étapes suivantes: a. hydrolyse d~un alkoxyde en solution aqueuse pour obtenir un hydrolysat et éventuellement évaporation jusqu'à une concentration optimale, b. ajout d~un oxyde préparé par voie pyrogénique, c. mélange de l~hydrolysat de l~alkoxyde avec l~oxyde préparé par voie pyrogénique pour former un sol colloïdal, d. retrait éventuel des impuretés du sol colloïdal, e. gélification du sol colloïdal dans un moule, f. remplacement éventuel de l~eau contenue dans l~aérogel obtenu par un solvant organique, g. séchage de l~aérogel, h. traitement thermique de l~aérogel séché, les impuretés étant retirées du sol colloïdal.
Boara Giulio
Costa Fulvio
Rueckemann Andreas
Degussa Novara Technology S.p.a.
Marks & Clerk
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