Process for preparing hydrophobic silicon dioxide aerogel using rice husk ash as raw material
Title：
Process for preparing hydrophobic silicon dioxide aerogel using rice husk ash as raw material
Application Number：
 200510012186
Application Date：
 2005/07/15
Announcement Date：
 2006/01/25
Pub. Date：
 2007/05/23
Publication Number：
 1724353
Announcement Number：
 1317188
Grant Date：
 2007-5-23
Granted Pub. Date：
 2007-5-23
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 C01B 33/14, C01B 33/158
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Wang Tao, Li Ting
Key Words：
 rice husk ash, hydrophobic, silicon dioxide aerogel, preparing process
Abstract：
 A process for preparing the hydrophobic SiO2 aero-gel from rice husk ash includes such steps as burning rice husk to obtain its ash, extracting its hydro-gel in inorganic strong-alkaline aqueous solution, neutralizing by inorganic strong acid, laying aside to generate SiO2 hydro-gel, filter, acid treating, ageing, water washing, displacing the water from the hydro-gel by organic solvent, supercritical drying and modifying surface. Its advantages are high specific surface area and pore volume, and low apparent density.
Claim：
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PCT：
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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
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