Rapid aerogel production process
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United States of America Patent
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Dec 30, 2003
Grant Date -
N/A
app pub date -
Oct 20, 2000
filing date -
Oct 21, 1999
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Abstract
Methods of more rapidly producing aerogel products by means of a rapid solvent exchange of solvent inside wet gels with supercritical CO.sub.2 by injecting supercritical, rather than liquid, CO.sub.2 into an extractor that has been pre-heated and pre-pressurized to substantially supercritical conditions or above. Preferably, pressure waves are applied to the supercritical CO.sub.2 to enhance the solvent exchange. The rapid solvent exchange process is followed by depressurization, optionally with a gas exchange. Preferably, pressure waves are used to speed up the depressurization. The process greatly reduces the time for forming aerogel products.
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