Solvent extraction of lubricating oils
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United States of America Patent
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Aug 20, 1991
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N/A
app pub date -
Nov 20, 1989
filing date -
Nov 20, 1989
priority date (Note) -
Expired
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Abstract
A lubricating oil stock is extracted with N-methyl-2-pyrrolidone to yield a primary raffinate useful as a high VI lubricating base oil and a primary extract. The primary extract is mixed with antisolvent and chilled to yield a secondary raffinate. This secondary raffinate is sufficiently reduced in aromatics that it is suitable for fluidized catalytic cracking in the absence of hydrogenation.
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