Separating solid particles from used lubricant compositions
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United States of America Patent
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Dec 14, 1999
Grant Date -
N/A
app pub date -
Apr 20, 1998
filing date -
Apr 20, 1998
priority date (Note) -
Expired
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Abstract
A process for separating oil from a lubricant composition containing solid particles. The contaminated lubricant composition is mixed with liquid or supercritical CO.sub.2 before the lubricant composition and CO.sub.2 mixture is filtered through a filter medium. The CO.sub.2 is then evaporated, leaving an oil residue. Mixing the lubricant composition with CO.sub.2 before filtration prevents the filter medium from being blinded by solid particles.
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