Lubricating oil refining process
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United States of America Patent
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Jul 12, 1994
Grant Date -
N/A
app pub date -
Apr 27, 1993
filing date -
Apr 27, 1993
priority date (Note) -
Expired
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Abstract
Thermal degradation of furfural in solvent refining of lubricating oil stocks is reduced by use of a thin-film evaporator for the final stages of furfural recovery, permitting increased pressure to be used in each stage of furfural recovery.
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