Process for preparing silicon dioxide aerogel using rice husk ash as raw material

A technology of silicon dioxide and rice husk ash, which is applied in the directions of silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve the problems such as there is no silicon dioxide aerogel, and achieves easy operation, reduced production cost, and improved technology. simple effect
CN1449997AInactive Publication Date: 2003-10-22TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2003-10-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The method for preparing silicon dioxide aerogel utilizing waste material rice husk ash obtained by combusting rice husk includes the following steps: soaking the rice husk ash in organic alkaline aqueous solution, using inorganic acid to neutralize alkaline solution to produce silicon dioxide hydrosol, ageing said hydrosol, substituting water content in the hydrosol with organic solvent, then substituting organic solvent with liquid CO2, then supercritical CO2 drying so as to obtain white silicon dioxide aerogel whose specific surface area is 297.3 sq.m / g, apparent density is 0.532 g / cu.cm and internal microporous average pore size is 22.3 nano.
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Description

technical field

[0001] The invention belongs to the technical scope of chemical material preparation, and in particular relates to a method for preparing silicon dioxide aerogel by using rice husk ash as a raw material, which fully utilizes waste residue rice husks produced in the rice production process to turn waste into treasure. technical background

[0002] Airgel is a lightweight nano-amorphous solid material containing a large amount of air, low density, and high porosity. Its slender nanoporous network makes it have very low refractive index, thermal conductivity and propagation velocity, and the characteristics of selective permeation of gas, which make airgel materials have been widely valued.

[0003] Among the many aerogels, the most studied is SiO 2 airgel. Since silica airgel is a porous material with nanometers, they are obviously different from porous materials with pore structures on the order of microns and millimeters, and show unique properties in terms...

Claims

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