Chemistry: physical processes – Physical processes – Crystallization
Patent
1997-08-26
1999-02-02
Straub, Gary P.
Chemistry: physical processes
Physical processes
Crystallization
23300, 424 65, 585833, B01D 900, B01D 1700, C07C 710
Patent
active
058649239
ABSTRACT:
A method for providing aerogels, and aerogels produced according to the method, is described. As one aspect, antiperspirant compounds that are in aerogel form, and antiperspirant and deodorant compositions including such salts, are described. The method involves contacting a solution containing material to be processed with a species selected to precipitate the material and selected so as to be miscible with the solvent system of the solution. After the material is precipitated, the material may be washed with the precipitating species until it is substantially free of solvent system. Then, the precipitating species containing the material precipitate is taken above its critical point, and the supercritical fluid is exhausted above its critical temperature. Alternately, a separate isolating species is introduced to displace the precipitating species, or the precipitating species/solvent system mixture. The isolating species then is taken above its critical point, and exhausted above its critical temperature. The invention provides for batch or continuous processes.
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Cao Wanqing
Carrillo Angel L.
Klotz Irving M.
McGovern William Edward
Moses John M.
CF Technologies, Inc.
Straub Gary P.
The Gillette Company
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