Cleaning process using carbon dioxide as a solvent and employing molecularly engineered surfactants
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United States of America Patent
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Aug 31, 1999
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app pub date -
May 2, 1997
filing date -
Nov 3, 1995
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Abstract
The separation of a contaminant from a substrate that carries the contaminant is disclosed. The process comprises contacting the substrate to a carbon dioxide fluid containing an amphiphilic species so that the contaminant associates with the amphiphilic species and becomes entrained in the carbon dioxide fluid. The substrate is then separated from the carbon dioxide fluid, and then the contaminant is separated from the carbon dioxide fluid.
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