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1. WO1996006051 - SUBCRITICAL PROCESS FOR DRYING SOL-GEL DERIVED POROUS BODIES

Publication Number WO/1996/006051
Publication Date 29.02.1996
International Application No. PCT/US1995/010468
International Filing Date 17.08.1995
Chapter 2 Demand Filed 26.02.1996
IPC
C03C 1/00 2006.01
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
1Ingredients generally applicable to manufacture of glasses, glazes or vitreous enamels
C03C 3/06 2006.01
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
3Glass compositions
04containing silica
06with more than 90% silica by weight, e.g. quartz
F26B 5/00 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
26DRYING
BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
5Drying solid materials or objects by processes not involving the application of heat
F26B 7/00 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
26DRYING
BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
7Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/ or F26B5/178
CPC
C03C 1/006
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
1Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
006to produce glass through wet route
C03C 2203/26
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
2203Production processes
20Wet processes, e.g. sol-gel process
26using alkoxides
C03C 3/06
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
3Glass compositions
04containing silica
06with more than 90% silica by weight, e.g. quartz
F26B 5/005
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
26DRYING
BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
5Drying solid materials or objects by processes not involving the application of heat
005by dipping them into or mixing them with a chemical liquid, e.g. organic; chemical, e.g. organic, dewatering aids
F26B 7/00
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
26DRYING
BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
7Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
Applicants
  • YAZAKI CORPORATION [JP/JP]; 17th floor Mita-kokusai Building 4-28, Mita 1-chome Minalo-ku Tokyo, JP (AllExceptUS)
  • KIRKBIR, Fikret [TR/US]; US (UsOnly)
  • RAY CHAUDHURI, Satyabrata [US/US]; US (UsOnly)
Inventors
  • KIRKBIR, Fikret; US
  • RAY CHAUDHURI, Satyabrata; US
Agents
  • BRUEGGEMANN, James, R.; Pretty, Schroeder, Brueggemann & Clark Suite 2000 444 South Flower Street Los Angeles, CA 90071, US
  • HOWDEN, Christopher, A.; Forrester & Boehmert Franz Joseph Strasse 38 D-80801 München, DE
Priority Data
08/292,87819.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SUBCRITICAL PROCESS FOR DRYING SOL-GEL DERIVED POROUS BODIES
(FR) PROCEDE DE SECHAGE DANS DES CONDITIONS SOUS-CRITIQUES, DE CORPS POREUX OBTENUS PAR UNE TRANSFORMATION SOL-GEL
Abstract
(EN)
A process is disclosed for drying sol-gel derived porous wet bodies without inducing cracks therein. The wet gel preferably is immersed in a liquid solvent before being placed inside a drying chamber capable of withstanding relatively high pressures and temperatures. After the wet gel is loaded, the chamber is sealed from the outside environment, and then is heated from outside the chamber in a controlled manner until a prescribed subcritical pressure is reached. The final temperature and pressure are always lower than the critical temperature and pressure of the drying solvent. The solvent vapor is then evacuated from the chamber in a controlled fashion to decrease the pressure until ambient pressure is reached, while preferably maintaining the temperature inside the chamber at the prescribed level. Thereafter, the inside of the chamber is purged with an inert gas for a prescribed time period, after which the chamber is cooled to ambient temperature and the dry crack-free porous gel is removed. The resulting dry gels are crack-free and monolithic.
(FR)
On décrit un procédé pour sécher des corps poreux humides obtenus par une transformation sol-gel, sans induire de fissures dans ces corps. De préférence, le gel humide est immergé dans un solvant liquide avant d'être placé à l'intérieur d'une chambre de séchage capable de supporter des pressions et des températures relativement élevées. Une fois que le gel humide a été chargé, la chambre est fermée et isolée de l'extérieur, et ensuite elle est chauffée de l'extérieur d'une manière contrôlée jusqu'à atteindre une pression sous-critique prescrite. La température et la pression finales sont toujours inférieures à la température et à la pression critiques du solvant de séchage. La vapeur du solvant est ensuite évacuée de la chambre d'une manière contrôlée, pour diminuer la pression jusqu'à atteindre la pression ambiante, tout en maintenant, de préférence, la température à l'intérieur de la chambre au niveau prescrit. Ensuite, on purge l'intérieur de la chambre avec un gaz inerte pendant une durée prédéterminée, puis on refroidit la chambre à la température ambiante et on sort le gel poreux sec, sans fissures. Les gels secs ainsi obtenus sont monolithiques et exempts de fissures.
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