Solvent dewaxing of lubricating oils
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United States of America Patent
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-
Apr 9, 1991
Grant Date -
N/A
app pub date -
May 23, 1990
filing date -
May 23, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improvement has been discovered in a process for solvent dewaxing a hydrocarbon lubricating oil stock. Solvent dewaxed oils are steam stripped and then vacuum dehydrated at 2.5 psia at the steam stripping temperature of 350.degree. F. to 450.degree. F. Nitrogen or natural gas having a dew point of -100.degree. F. or lower is contacted with the oil at 0.5 to 1 SCF/bbl. A solvent free lubricating oil is produced which is water haze free in cold storage.
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