C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 33/158 (2006.01) C01B 33/16 (2006.01) C03C 1/00 (2006.01) C03C 3/06 (2006.01) C04B 35/111 (2006.01) C04B 35/14 (2006.01) C04B 35/46 (2006.01) C04B 35/624 (2006.01)
Patent
CA 2346288
A sol-gel process for producing dry porous metal oxide monoliths, e.g., silica glass monoliths, in which the successive process steps of gelling, aging and drying all occur within a mold formed of a porous non-organic-polymer material, e.g., graphite. The mold is inert to the gel solution and has sufficient strength to withstand the temperatures and pressures encountered during the process. The mold and gel thereby can remain within a sealed autoclave during these process steps, and mechanical handling of the mold and the gel are minimized. This substantially enhances the process' efficiency. Alternatively, the mold can have a non-porous inner skin to enhance ease of cleaning of the mold, and of removal of the gel.
La présente invention concerne un procédé sol-gel de production de monolithes d'oxyde métallique poreux secs, tels que les monolithes de verre de silice par exemple, dans lequel les étapes successives de gélification, de vieillissement et de séchage s'effectuent toutes dans un moule en matériau non organique polymère, par exemple, le graphite. Le moule est inerte par rapport à la solution gélifiée et il est suffisamment solide pour résister aux températures et aux pressions subies lors du processus. Le moule et le gel peuvent ainsi rester dans une autoclave hermétique pendant toute la durée du processus, réduisant au minimum leur manipulation mécanique et augmentant nettement l'efficacité du processus. Dans une variante, le moule peut comporter une peau interne non poreuse qui facilite le nettoyage du moule et le retrait du gel.
Ganguli Rahul
Kirkbir Fikret
Meyers Douglas
Gowling Lafleur Henderson Llp
Yazaki Corporation
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